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### Anderson's bridge.pptx

• 1. Anderson’s Bridge Mrs.P.Kanmani, Assistant Professor, Department of Physics, V.Vanniaperumal Collegefor Women, Virudhunagar.
• 2. Anderson’s Bridge Principle: The bridge circuits are used to measure various component values like resistance, capacitance, inductance, etc. The simple form of a bridge circuit consists of a network of four resistances/impedance arms that forms a closed circuit. A current source is applied to two opposite nodes and a current detector is connected to the remaining two nodes.
• 3. Anderson’sBridge Principle: The bridge circuits use the null indication principle and comparison measurement method, this is also known as “Bridge Balance condition at zero voltage. The bridge circuit compares the values of an unknown component with that of an accurately known standard component. Thus, the accuracy mostly depends on the bridge circuit, not on the null-indicator. Anderson's Bridge, in fact, is a modification of Maxwell's inductance capacitance bridge. In Anderson's Bridge, the self inductance is measured in terms of a standard capacitor.
• 4. Anderson’s Bridge L =self-inductanceto bemeasuredhenry, S’=resistanceof self-inductor in ohm, S=resistanceconnected in serieswith self-inductor in ohm, P,Q,R =known non-inductive resistances in ohm, and C=fixed standardcapacitor L =C[r(R+S+S’)+QR] henry
• 5. Anderson’s Bridge Aim : Todeterminetheself inductance of thecoil (L) usingAnderson’s bridge. Apparatus : Resistance boxes,capacitance, Self inductance to bemeasured,Head phone.
• 6. Anderson’s Bridge Procedure: Connections are made as shown in the theory. A.C. source say a 1000Hz audio-oscilloscope and a head set is used here. Keeping the value of P, Q, R and S constant, adjust the value of variable resistance r till the sound is reduced to a minimum value. This is the balancing point of the alternating current. Note the value of resistance r and capacitor C. Repeat the experiment with differenct P ,Q and R,S values and calculate the self inductanceof the coilusing equation.
• 7. Anderson’s Bridge Table : S.NO P = Q R in oh m S in ohm r in ohm L = C[r (R+S+S’)+QR] in henry Result : TheSelf inductanceof the givencoil=---------------
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