List of top Physics Questions on Moving charges and magnetism asked in KEAM

A magnetic field of (10^-4\(\hat{k}\))T exerts a force of (4\(\hat{i}\)-3\(\hat{j}\))x10^-12N on a particle having a charge of 10^-9 C. The speed of the particle is:

An electron and a proton moving with same velocity v enter into a uniform perpendicular magnetic field. Then

The shunt resistance required to allow $4\%$ of the main current through the galvanometer of resistance $48 \, \Omega$ is

Ampere?s circuital law can be derived from

A $ 2\mu C $ charge moving around a circle with a frequency of $ 6.25\times {{10}^{12}}Hz $ produces a magnetic field $6.28\, T$ at the centre of the circle. The radius of the circle is

A particle of mass $m$ and charge $q$ with an initial velocity $v$ is subjected to a uniform magnetic field $B$ along the vertical direction. The particle will

Consider a circular loop of radius R on the xy-plane carrying a steady current anticlockwise. The magnetic field at the center of the loop is given by

If a magnetic dipole of moment $M$ situated in the direction of a magnetic field $B$ is rotated by $180^{\circ}$, then the amount of work done is

Two particles $A$ and $B$ having equal charges $+6\, C$, after being accelerated through the same potential difference, enter a region of uniform magnetic field and describe circular paths of radii $2\,cm$ and $3\, cm$ respectively. The ratio of mass of $A$ to that of $B$ is

Two wires with currents $2\,A$ and $1\,A$ are enclosed in a circular loop. Another wire with current $3\, A$ is situated outside the loop as shown. Then $ \oint{\overrightarrow{B}}.\overrightarrow{dl} $ around the loop is