A particle consisting of two electrons is moving in a magnetic field of (3i+2j)T a velocity  The magnetic force acting on the particle will be

What is the net force on the square coil

A proton is to circulate the earth along the equator with a speed of 1⋅0×107ms⁻¹. Find the minimum magnetic field which should be created at the equator for this purpose. The mass of proton = 1⋅7×10⁻²⁷kg and radius of earth = 6⋅37×10⁶m

An α-particle is describing a circle of radius 0.45 m in a field of magnetic induction 1.2 weber/m². The potential difference required to accelerate the particle, so as to give this much energy to it (The mass of α-particle is 6.8 × 10^-27 kg and its charge is 3.2 × 10^–19 coulomb.) will be- 

An electron beam passes through a magnetic field of 2×10⁻³ weber/m² and an electric field of 1⋅0×10⁴Vm⁻¹ both acting simultaneously. The path of electrons remaining undeviated, calculate the speed of the electrons. If the electric field is removed what will be the radius of the electron path?

A one meter long wire is lying at right angles to the magnetic field. A force of 1 kg wt is acting on it in a magnetic field of 0.98 Tesla. The current flowing in it will be

A circular coil of radius 4 cm and 20 turns carries a current of 3 ampere. It is placed in a magnetic field of 0.5 T. The magnetic dipole moment of the coil is

A circular coil of radius 4 cm has 50 turns. In this coil a current of 2 A is flowing. It is placed in a magnetic field of 0.1 weber/m². The amount of work done in rotating it through 180° from its equilibrium position will be

The deflection in a moving coil galvanometer is

A moving coil galvanometer has a coil of effective area A and number of turns N. The magnetic field B is radial. If a current I is passed through the coil, the torque acting on the coil is.