Force and Torqu...

A circular loop is placed in an external magnetic field. How is the torque 'τ' related to radius 'r' of the loop?

What is the torque experienced by a circular loop with 1 turn which is suspended in a magnetic field B and current i passes through it?

If the distance between the two parallel current-carrying conductors (same current flowing in the same direction in each of them) is increased then the force between two conductors will-

Which of the following statement is incorrect regarding magnetic field produced due to a straight current carrying conductor?

A 300 mm long conductor is carrying a current of 10 A and is situated at right angles to a magnetic field having a flux density of 0.8 T; the force on the conductor will be

A moving coil galvanometer can be converted into a ammeter by connecting to the moving coil galvanometer 

Current sensitivity of a moving coil galvanometer is 5 div/mA and its voltage sensitivity (angular deflection per unit voltage applied) is 20 div/V. The resistance of the galvanometer is

If currents in two parallel wires flow in opposite directions, the force between the wires will be

A charge moves in a circle perpendicular to a magnetic field. Upon which of the following the time period of revolution, does not depend?

A charge particle is moving on a circular path of radius R in a uniform magnetic field under the Lorentz force F. How much work is done by the force in one round?