Electro magnetic fields

1. Code No: 07A3EC04 Set No. 1
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
II B.Tech. I Sem., I Mid-Term Examinations, Aug./Sept. – 2009
ELECTROMAGNETIC FIELDS
Objective Exam
Name: ______________________________ Hall Ticket No.
Answer All Questions. All Questions Carry Equal Marks.Time: 20 Min. Marks: 20.
A
I Choose the correct alternative:
1. In rectangular co-ordinate system the unit vectors are mutually _____ to each other.[ ]
a. parallel b. perpendicular c. co-ordinate d. unit
2. F12 and F13 are two forces of 2 and 3 newtons. F13 maker an angle 30o with normal as shown in the diagram.
Find the force acting in x- direction [ ]
a. 5N b. 3.5N c. 1N d. -1 N
3. ____ law states that the net electric flux passing through any closed surface is equal to the total charge enclosed by that surface.
a. equipotential b. Gauss c. point charge d. Maxwell’s [ ]
4. An electron is placed mid-way between two equal and opposite charges. The electron will
a. be thrown out of field b. spin in the field
c. remain stationary d. oscillate between the charges. [ ]
5. The electric field strength of a charge
a. increases with distance b. decreases with distance
c. decreases with square of distance d. decreases with cube of distance. [ ]
6. Which of the following is not a scalar field [ ]
a) displacement of a mosquito in space b) high intensity in drawing room
c) temperature distribution in your class room d) atmospheric pressure in agiven region.
7. A point charge of 3x10-6 coulomb is 12cm from a second point charge of -1.5 x 10-6coulomb. The magnitude and direction of the Force on each charge is ________ [ ]
a) 2 N directed away from each other b) 2.81N directed towards each other
c) 2.81 N directed away from each other d) 2N towards each other
Cont…2

2. Code No: 07A3EC04 :2: Set No. 1
8. ________ is defined as the vector force on a unit positive test charge. [ ]
a) potential b) electric field c) mmf d) Electric field intensity
9. If Curl of a vector field is zero, then that field is called as _______ field. [ ]
a) Solenoidal b) irrotational c) point d) Gauss
10. The net outflow of flux per unit volume is called as the [ ]
a) gradient b) divergence c) curl d) unit vector
II Fill in the blanks
11. The volume charge density . Find 220vs = .J∇ at 10 seconds?
12. The displacement current, Id =________
13. __________ is defined as the ratio of permittivity of the dielectric to that of Free space
14. If 21020,xzDxyuxyus=+ ________ at (1,1,0)
15. A scalar function, V is given by V=xy z2. The gradient of V. is ___________
16. For steady currents the continuity equation is _________
17. Capacitance offered by an Isolated sphere with radius r is _________
18. For a spherical capacitor, the capacitance c is ___________
19. If .DE∇⋅=∈∇ and .Jσ∇=∇ in a given material, the material is said to be _______and ________
20. The relaxation time of mica is _________ 15(10/,6rmhosmσ−=
-oOo-

3. Code No: 07A3EC04 Set No. 2
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
II B.Tech. I Sem., I Mid-Term Examinations, Aug./Sept. – 2009
ELECTROMAGNETIC FIELDS
Objective Exam
Name: ______________________________ Hall Ticket No.
Answer All Questions. All Questions Carry Equal Marks.Time: 20 Min. Marks: 20.
A
I Choose the correct alternative:
1. An electron is placed mid-way between two equal and opposite charges. The electron will
a. be thrown out of field b. spin in the field
c. remain stationary d. oscillate between the charges. [ ]
2. The electric field strength of a charge
a. increases with distance b. decreases with distance
c. decreases with square of distance d. decreases with cube of distance. [ ]
3. Which of the following is not a scalar field [ ]
a) displacement of a mosquito in space b) high intensity in drawing room
c) temperature distribution in your class room d) atmospheric pressure in agiven region.
4. A point charge of 3x10-6 coulomb is 12cm from a second point charge of -1.5 x 10-6coulomb. The magnitude and direction of the Force on each charge is ________ [ ]
a) 2 N directed away from each other b) 2.81N directed towards each other
c) 2.81 N directed away from each other d) 2N towards each other
5. ________ is defined as the vector force on a unit positive test charge. [ ]
a) potential b) electric field c) mmf d) Electric field intensity
6. If Curl of a vector field is zero, then that field is called as _______ field. [ ]
a) Solenoidal b) irrotational c) point d) Gauss
7. The net outflow of flux per unit volume is called as the [ ]
a) gradient b) divergence c) curl d) unit vector
8. In rectangular co-ordinate system the unit vectors are mutually _____ to each other. [ ]
a. parallel b. perpendicular c. co-ordinate d. unit
Cont…2

4. Code No: 07A3EC04 :2: Set No. 2
9. F12 and F13 are two forces of 2 and 3 newtons. F13 maker an angle 30o with normal as shown in the diagram.
Find the force acting in x- direction [ ]
a. 5N b. 3.5N c. 1N d. -1 N
10. ____ law states that the net electric flux passing through any closed surface is equal to the total charge enclosed by that surface.
a. equipotential b. Gauss c. point charge d. Maxwell’s [ ]
II Fill in the blanks
11. If 21020,xzDxyuxyus=+ ________ at (1,1,0)
12. A scalar function, V is given by V=xy z2. The gradient of V. is ___________
13. For steady currents the continuity equation is _________
14. Capacitance offered by an Isolated sphere with radius r is _________
15. For a spherical capacitor, the capacitance c is ___________
16. If .DE∇⋅=∈∇ and .Jσ∇=∇ in a given material, the material is said to be _______and ________
17. The relaxation time of mica is _________ 15(10/,6rmhosmσ−=
18. The volume charge density . Find 220vs =.J∇ at 10 seconds?
19. The displacement current, Id =________
20. __________ is defined as the ratio of permittivity of the dielectric to that of Free space
-oOo-

5. Code No: 07A3EC04 Set No. 3
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
II B.Tech. I Sem., I Mid-Term Examinations, Aug./Sept. – 2009
ELECTROMAGNETIC FIELDS
Objective Exam
Name: ______________________________ Hall Ticket No.
Answer All Questions. All Questions Carry Equal Marks.Time: 20 Min. Marks: 20.
A
I Choose the correct alternative:
1. Which of the following is not a scalar field [ ]
a) displacement of a mosquito in space b) high intensity in drawing room
c) temperature distribution in your class room d) atmospheric pressure in agiven region.
2. A point charge of 3x10-6 coulomb is 12cm from a second point charge of -1.5 x 10-6coulomb. The magnitude and direction of the Force on each charge is ________ [ ]
a) 2 N directed away from each other b) 2.81N directed towards each other
c) 2.81 N directed away from each other d) 2N towards each other
3. ________ is defined as the vector force on a unit positive test charge. [ ]
a) potential b) electric field c) mmf d) Electric field intensity
4. If Curl of a vector field is zero, then that field is called as _______ field. [ ]
a) Solenoidal b) irrotational c) point d) Gauss
5. The net outflow of flux per unit volume is called as the [ ]
a) gradient b) divergence c) curl d) unit vector
6. In rectangular co-ordinate system the unit vectors are mutually _____ to each other. [ ]
a. parallel b. perpendicular c. co-ordinate d. unit
7. F12 and F13 are two forces of 2 and 3 newtons. F13 maker an angle 30o with normal as shown in the diagram.
Find the force acting in x- direction [ ]
a. 5N b. 3.5N c. 1N d. -1 N
8. ____ law states that the net electric flux passing through any closed surface is equal to the total charge enclosed by that surface.
a. equipotential b. Gauss c. point charge d. Maxwell’s [ ]
Cont…2

6. Code No: 07A3EC04 :2: Set No. 3
9. An electron is placed mid-way between two equal and opposite charges. The electron will
a. be thrown out of field b. spin in the field
c. remain stationary d. oscillate between the charges. [ ]
10. The electric field strength of a charge
a. increases with distance b. decreases with distance
c. decreases with square of distance d. decreases with cube of distance. [ ]
II Fill in the blanks
11. For steady currents the continuity equation is _________
12. Capacitance offered by an Isolated sphere with radius r is _________
13. For a spherical capacitor, the capacitance c is ___________
14. If .DE∇⋅=∈∇ and .Jσ∇=∇ in a given material, the material is said to be _______and ________
15. The relaxation time of mica is _________ 15(10/,6rmhosmσ−=
16. The volume charge density . Find 220vs =.J∇ at 10 seconds?
17. The displacement current, Id =________
18. __________ is defined as the ratio of permittivity of the dielectric to that of Free space
19. If 21020,xzDxyuxyus=+ ________ at (1,1,0)
20. A scalar function, V is given by V=xy z2. The gradient of V. is ___________
-oOo-

7. Code No: 07A3EC04 Set No. 4
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
II B.Tech. I Sem., I Mid-Term Examinations, Aug./Sept. – 2009
ELECTROMAGNETIC FIELDS
Objective Exam
Name: ______________________________ Hall Ticket No.
Answer All Questions. All Questions Carry Equal Marks.Time: 20 Min. Marks: 20.
A
I Choose the correct alternative:
1. ________ is defined as the vector force on a unit positive test charge. [ ]
a) potential b) electric field c) mmf d) Electric field intensity
2. If Curl of a vector field is zero, then that field is called as _______ field. [ ]
a) Solenoidal b) irrotational c) point d) Gauss
3. The net outflow of flux per unit volume is called as the [ ]
a) gradient b) divergence c) curl d) unit vector
4. In rectangular co-ordinate system the unit vectors are mutually _____ to each other. [ ]
a. parallel b. perpendicular c. co-ordinate d. unit
5. F12 and F13 are two forces of 2 and 3 newtons. F13 maker an angle 30o with normal as shown in the diagram.
Find the force acting in x- direction [ ]
a. 5N b. 3.5N c. 1N d. -1 N
6. ____ law states that the net electric flux passing through any closed surface is equal to the total charge enclosed by that surface.
a. equipotential b. Gauss c. point charge d. Maxwell’s [ ]
7. An electron is placed mid-way between two equal and opposite charges. The electron will
a. be thrown out of field b. spin in the field
c. remain stationary d. oscillate between the charges. [ ]
8. The electric field strength of a charge
a. increases with distance b. decreases with distance
c. decreases with square of distance d. decreases with cube of distance. [ ]
Cont…2

8. Code No: 07A3EC04 :2: Set No. 4
9. Which of the following is not a scalar field [ ]
a) displacement of a mosquito in space b) high intensity in drawing room
c) temperature distribution in your class room d) atmospheric pressure in agiven region.
10. A point charge of 3x10-6 coulomb is 12cm from a second point charge of -1.5 x 10-6coulomb. The magnitude and direction of the Force on each charge is ________ [ ]
a) 2 N directed away from each other b) 2.81N directed towards each other
c) 2.81 N directed away from each other d) 2N towards each other
II Fill in the blanks
11. For a spherical capacitor, the capacitance c is ___________
12. If .DE∇⋅=∈∇ and .Jσ∇=∇ in a given material, the material is said to be _______and ________
13. The relaxation time of mica is _________ 15(10/,6rmhosmσ−=
14. The volume charge density . Find 220vs =.J∇ at 10 seconds?
15. The displacement current, Id =________
16. __________ is defined as the ratio of permittivity of the dielectric to that of Free space
17. If 21020,xzDxyuxyus=+ ________ at (1,1,0)
18. A scalar function, V is given by V=xy z2. The gradient of V. is ___________
19. For steady currents the continuity equation is _________
20. Capacitance offered by an Isolated sphere with radius r is _________
-oOo-