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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