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

A charged particle having charge $q$ is moving perpendicularly to the uniform magnetic field with linear speed $v$ on a circular path of radius $R$. The periodic time of revolution of a particle ______.
A horizontal overhead power line carries a current of 90 A in east to west direction. What is the magnitude and direction of the magnetic field due to the current 1.2 m above the line?
In the moving coil galvanometer, if number of turns in the coil is doubled, then the current sensitivity ______ and the voltage sensitivity ______.