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

When two mutually perpendicular alternating magnetic field superimposed on each other, the resulting field is:

A proton enters a magnetic field of flux density $1.5 \,Wb / m ^{2}$ with a speed of $2 \times 10^{7} m / s$ at angle of $30^{\circ}$ with the field. The force on a proton will be

The time of vibration of a dip needle vibration in the vertical plane in the magnetic meridian is $3 s$ . When the same magnetic needle is made to vibrate in the horizontal plane, the time of vibration is 3 $ \sqrt{2} $ s. Then angle of dip will be