Question

Two resistors each $4\Omega$ are connected in the left and right gaps of a meter bridge and balance point is obtained. Now a $4\Omega$ resistor is connected is series with that in the left gap and another $4\Omega$ resistor is connected in parallel with that in the right gap. The shift in the balance point is

• A. 80 cm to the right
• B. 30 cm to the left
• C. 20 cm to the left
• D. 30 cm to the right

Answer 1

The correct option is D

30 cm to the right

First balance point is at 50 cm. Next left gap contains $8\Omega$ and right gap contains $2\Omega$ . Hence the balance point is at 80 cm.Refer to text book, Example problem.