The document discusses the forces between two parallel current-carrying conductors, detailing observations made by Ampere in 1820 regarding attraction and repulsion based on current direction. It outlines two main cases: one where currents flow in the same direction and another where they flow in opposite directions, influencing the forces experienced by each wire. Additionally, it defines 1 ampere as the current producing a specific force per unit length between two wires placed 1 meter apart.

1. FORCE BETWEEN TWO
PARALLEL CURRENT
CARRYING
CONDUCTOR
-SARIKA
KUMARI
CLASS : XII A

2. Table of contents
01
02
03
INTRODUCTION
CASES
DEFINING 1 AMPERE

3. Introduction
01

4. OBSERVATION
It was first observed by Ampere in
1820 that two parallel straight
conductors carrying currents in the
same direction attract each other
and those carrying currents in the
opposite directions repel each
other.

5. CASES
02

6. CASE 1 :
when both current are in the same
direction
Let us consider two wires, wire (1) and wire (2) having current
Ia and Ib respectively.
The second wire (2) is placed in the magnetic field of the first
wire(1), therefore it will experience a force,
Force per
unit length

7. Similarly, Force on wire 1 due to wire 2 will be
Force per
unit length

8. CASE 2 :
when both current are in the opposite direction
Again, consider wire (1) and wire (2) having current Ia
and Ib respectively.
Force on wire 2 due to wire 1 :
d

9. Similarly, Force on wire 1 due to wire 2 :
THEREFORE,

10. DEFINING
1 AMPERE
03

11. 1
AMPERE:
1 Ampere is that current
which when flows in
two parallel wires kept
at 1 m apart, produces a
force of attraction per
unit length between
them of 2 x 10^-7 N/m

12. Q : FIND net force per unit length on wire B.
1m 1m

13. Thank you !!