Moving Charges ...

A circular coil of radius 4 cm and of 20 turns carries a current of 3 amperes. It is placed in a magnetic field of intensity of 0.5 weber/m². The magnetic dipole moment of the coil is

A closed loop PQRS carrying a current is placed in a uniform magnetic field. If the magnetic forces on segment PS, SR and RQ are F₁, F₂ and F₃ respectively and are in the plane of the paper and along the directions shown, the force on the segment QP is

If two streams of protons move parallel to each other in the same direction, then they

Two parallel wires carrying currents in the same direction attract each other because of

Two straight parallel wires, both carrying 10 ampere in the same direction attract each other with a force of 1 × 10^–3 N. If both currents are doubled, the force of attraction will be

A small circular flexible loop of wire of radius r carries a current I. It is placed in a uniform magnetic field B. The tension in the loop will be doubled if

The deflection in a moving coil galvanometer is

In a moving coil galvanometer, the deflection of the coil θ is related to the electrical current i by the relation

The unit of electric current \"ampere\" is the current which when flowing through each of two parallel wires spaced 1 m apart in vaccum and of infinite length will give rise to a force between them equal to

An electron moves with a constant speed v along a circle of radius r. Its magnetic moment will be (e is the electron\'s charge)