Embibe Experts Solutions for Chapter: Magnetic Effect of Current, Exercise 1: BITSAT 2017

An electron revolves in a circular orbit of radius $r$ with angular speed $\omega$. The magnetic field at the centre of electron orbit is

The magnetic field at the centre $O$ of the current-carrying square loop shown in the figure is

A proton is revolving on a circular path of radius $2 \mathrm{mm}$ with frequency $10 \mathrm{Hz}$. Magnetic dipole moment associated with proton is

An ammeter of resistance $1.5 \mathrm{\Omega }$ can measure currents upto $1 \mathrm{A}$. The value of shunt resistance to measure current upto $4 \mathrm{A}$ is

A current $i$ flows through a loop as shown in figure. The magnetic field at the Centre $O$ is

The ratio of angular momentum $L$ to the atomic dipole moment ${\mu }_i$ for hydrogen like atoms and ions is

A copper rod of mass $m$ slides under gravity on two smooth parallel rails $l$ distance apart and set an angle $\theta$ to the horizontal. At the bottom, the rails are joined by a resistance $R$ in figure. There is a uniform magnetic field $B$ perpendicular to the plane of the rails. The terminal velocity of rod is

To increase the current sensitivity of a moving coil galvanometer by $50 \%,$ its resistance is increased, so that new resistance becomes twice its initial resistance, by what factor does its voltage sensitivity change?