JEE Main 2015 · 11 Apr · Shift 1 · Physics Q30

← JEE Main 2015 · 11 Apr · Shift 1

PhysicsSingle correct+4 / -1Question 30 of 90

The AC voltage across a resistance can be measured using a :

potentiometer

moving coil galvanometer

moving magnet galvanometer

hot wire voltmeter

Answer and worked solution

Official answer: D

A hot-wire instrument responds to $I^2R$ heating, so it reads AC (rms) values. Moving-coil and moving-magnet galvanometers average to zero on AC, and a potentiometer is a DC device.

Topics:AC basics and RMS values Ammeters and voltmeters

← Previous question Next question →

JEE Main 2015 · 11 Apr · Shift 1, Physics question 30