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STANDARDPhysics-Current Electricity

STANDARD Physics Wheatstone Bridge MCQ Question

Type: MCQ-conceptual-Medium-Class 12

In the shown figure, bridge is balanced, the current flowing through 2 Ω resistance is

A

10/7 A

B

11/7 A

C

13/7 A

D

8/7 A

Correct Answer

Option A

Detailed Explanation

Let I be the current flowing through PQR then the current flowing through PSR is (2 − I) A. Now since, galvanometer shows no deflection then the voltage through arm PQR is same as the voltage through arm PSR. I(4 + 2) = (2 − I) (10 + 5) ⇒ 6I = 30 − 15 I ⇒ 21I = 30 ⇒ I = 30/21 = 10/7 A. Hence the current through 2 Ω resistor is 10/7 A.

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