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  • (a) Use Kirchhoff's rules, calculate the current in the arm AC of the given circuit. (b) On what principl

(a) Use Kirchhoff's rules, calculate the current in the arm AC of the given circuit.

(b) On what principle does the meter bridge work? Why are the metal strips used in the bridge?

 

 

 

 
 
 
 
 

Answers (1)

Apply KVL in AEFCA

40-40 (I_{1}+I_{2})-30I_{1}=0

7I_{1}+4I_{2}=4          .............(1)

Apply KVL in CABDCA

40-40\left (I_{2}+I_{1} \right )+80-20I_{2}=0

6I_{2}+4I_{1}=12

3I_{2}+2I_{1}=6            ...........(2)

I_{1}=\frac{-12}{13}A,I_{2}=\frac{34}{13}A

Current through AC = I_{1}+I_{2}=\frac{22}{13}A

(b) Meterbridge works on the principle of balanced Wheatstone's bridge.

Metal strips are used to connect the circuit because metal strips have very less resistance so that additional resistance is not added through the circuit.

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Safeer PP

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