Moving Charges ...

Best method to increase the sensitivity of the moving coil galvanometer is to decrease

A moving coil type of galvanometer is based upon the principle that

Identify the quantity which changes when a charged particle moves through a magnetic field ?

There is $$10$$ units of charge at the centre of a circle of radius $$10m$$. The work done in moving one unit of charge around the circle once is 

Calculate the work done on electron beam which is moving in a magnetic field ?  

A charged particle is moving through uniform magnetic field, then in which case will magnetic field exert force on charged particle ?

The magnetic force acting on a charged particle of charge $$-2\mu c$$ in a magnetic field of 2T acting in y direction, when the particle velocity is $$(2\hat{i}+3\hat{j})\times10^6\;ms^{-1}$$, is :

A proton is fired with a speed of $$2\times10^6$$ m/s at an angle of $$60^o$$ to the X- axis. If a uniform magnetic field of $$0.1T$$ is applied along the Y- axis, the force acting on the proton is

Force between the two parallel wires carrying currents has been used to define 

In a moving coil galvanometer, the magnetic pole pieces are made cylindrical and a soft iron core is placed at the centre of the coil,the purpose for doing so is: