Question

Consider a circuit having 3 identical Ammeters A1, A2, A3 parallel to one another. The 1^st Ammeter is in series with a resistance, the 2^nd Ammeter is in series with a capacitor and the circuit is excited by a voltage V.  If A1 and A3 read 5 and 13 A respectively, reading of A2 will be?

(a) 8 A

(b) 13 A

(c) 18 A

(d) 12 A

This question was addressed to me in an online interview.

Question is from Advanced Problems Involving Complex Circuit Diagram in division Network Theory and Complex Circuit Diagram of Network Theory

Answer 1

The correct option is (d) 12 A

The best I can explain: We can infer from the circuit,

A2 = \(\sqrt{13^2 – 5^2}\)

Or, A2 = \(\sqrt{169 – 25}\)

Or, A2 = \(\sqrt{144}\)

Or, A2 = 12 A.