Question

ln the circuit shown here, the ammeter A reads 5 A and the voltmeter V reads 20 V. The correct value of resistance R is

(A) Exactly 4 Ω

(B) Slightly greater than 4 Ω

(C) Slightly less than 4 Ω

(D) Zero

Answer 1

Correct option  (B) Slightly greater than 4 Ω

Explanation:

Voltmeter is not ideal so a small amount of current will pass through it. Hence voltage drop across R will 20 V if R is lightly greater than 4 Ω.