A particle with ${10^{ - 11}}\,coulomb$ of charge and ${10^{ - 7}}\,kg$ mass is moving with a velocity of ${10^8}\,m/s$ along the $y$-axis. A uniform static magnetic field $B = 0.5\,Tesla$ is acting along the $x$-direction. The force on the particle is
$5 \times {10^{ - 11}}\,N$ along $\hat i$
$5 \times {10^3}\,N$ along $\hat k$
$5 \times {10^{ - 11}}\,N$ along $ - \hat j$
$5 \times {10^{ - 4}}\,N$ along $ - \hat k$
The dimension of the magnetic field intensity $B$ is
An $\alpha - $ particle travels in a circular path of radius $0.45\, m$ in a magnetic field $B = 1.2\,Wb/{m^2}$ with a speed of $2.6 \times {10^7}\,m/\sec $. The period of revolution of the $\alpha - $ particle is
An electron moves along vertical line and away from the observer, then pattern of concentric circular magnetic field lines which are produced due to its motion
If an electron enters a magnetic field with its velocity pointing in the same direction as the magnetic field, then
A particle of mass $m$ and charge $q$ enters a magnetic field $B$ perpendicularly with a velocity $v$, The radius of the circular path described by it will be