Question

In the circuit given below the ammeter reading is zero.What is the value of the resistance R?

• A. 50 $\Omega$
• B. 100 $\Omega$
• C. 200 $\Omega$
• D. 400 $\Omega$

Answer 1

Answer: (B)

100 $\Omega$

Answer 2

The terminal potential difference across R due to 12 V battery should be equal to 2V, which is the emf of the cell in the loop containing the ammeter.