Embibe Experts Solutions for Chapter: Magnetic Effect of Electric Current, Exercise 1: Exercise 1

An electric motor is used to convert

A wire of length $L$ carries current $I$ along $x$ axis. A magnetic field $B=B_0(\hat{ı}-\hat{ȷ}-\hat{k})T$ acts on the wire. The magnitude of magnetic force acting on the wire is

$AB$ and $CD$ are fixed conducting smooth rails placed in a vertical plane and joined by a constant current source at its upper end. $PQ$ is a conducting rod which is free to slide on the rails. A horizontal uniform magnetic field exists in space as shown. If the rod $PQ$ is released from rest then,

An ammeter and a milliammeter are converted from identical galvanometers. Which one has smaller resistance?

Sensitivity of a moving coil galvanometer can be increased by:

In an attempt to increases the current sensitivity of a moving coil galvanometer, it is found that its resistance becomes double while the current sensitivity increases by $10\%$. The voltage sensitivity of the galvanometer changes by

If the number of turns and radius of cross section of the coil of a tangent galvanometer are doubled, then the reduction factor $K$ will become

A short bar magnet passes at a steady speed right through a long solenoid. A galvanometer is connected across the solenoid. Which graph best represents the variation of the galvanometer deflection $\theta$ with time $t ?$