A proton moves with velocity in a uniform magnetic field

PHYSICS · Single correct · CBSE · Physics · Moving Charges and Magnetism · Moving Charges and Magnetism

Problem

A proton moves with velocity

\vec v = 2\hat i + 3\hat j + 4\hat k\,\text{m s}^{-1}

in a uniform magnetic field

\vec B = \hat i - 2\hat j + 2\hat k\,\text{T}

. Calculate the angle (to the nearest degree) between the magnetic force on the proton and the positive

x

–axis. (a)

71^{\circ}

(b)

26.6^{\circ}

(c)

63.4^{\circ}

(d)

90^{\circ}