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Q.

The given Wheatstone bridge is showing no deflection in the galvanometer joined between the points A and B. The  value of resistance R as shown in the circuit is

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a

150Ω

b

100Ω

c

50Ω

d

200Ω

answer is B.

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Detailed Solution

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The wheat stone bridge would be balanced, 100200R200+R=400400

⇒200R200+R=100⇒R=200Ω

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The given Wheatstone bridge is showing no deflection in the galvanometer joined between the points A and B. The  value of resistance R as shown in the circuit is