Magnetism Mock Tests

The magnetic field at the center of a circular coil of N turns, radius R, carrying current I is:

The force between two parallel current-carrying conductors is:

A charged particle moves in a uniform magnetic field B in a circular path of radius R with speed v. If the speed is doubled and the magnetic field is halved, the new radius of the circular path is:

The SI unit of magnetic flux is:

A moving coil galvanometer has a coil of N turns, area A, carrying current I, in a magnetic field B. The deflection θ is proportional to:

A galvanometer with coil resistance G and full-scale deflection current I_g is converted to a voltmeter of range V by connecting a resistance R in series. The same galvanometer is converted to an ammeter of range I by connecting a shunt resistance S in parallel. If R/S = V/I, then:

A charged particle moves in uniform B field perpendicular to velocity. If kinetic energy is doubled (charge and B constant), the radius of circular path becomes:

Two long straight parallel conductors A and B separated by distance d carry currents I and 2I in the same direction. The force per unit length on conductor A is F. If the current in A is doubled and the distance is increased to 3d, the new force per unit length on A is: