A magnetic field produced by a coil of wire is much stronger than that produced by the same wire when it is stretched in a straight line.

The magnetic field produced around a straight line wire when current flows through it is

Find the value of magnetic field produced by a current flowing through a semi circular arc of wire.

State the expression for the magnetic field due to a circular are of wire carrying a current I. Hence find the magnetic field at the centre of circular coil and having n turns.

A uniform electric field and a uniform magnetic field are produced, pointed in the same direction. An electron is projected with its velocity pointing in the same direction. Then,

Derive an expression for the magnetic field produced by a current flowing through a circular arc of the wire.

A straight wire of length 0.5 metre and carrying a current of 1.2 ampere is placed in a uniform magnetic field of induction 2 tesla. If the magnetic field is perpendicular to the length of the wire , the force acting on the wire is

The ratio of radii of two wires of same material is 2 : 1. If they are stretched by the same force, the ratio of their stress is

The direction of magnetic field produced around a long straight conductor is given by

A wire of resistance 100 Omega is uniformly stretched until its length increases by 5% . What will be its resistance after stretching? Assume that the volume of the wire remains the same when it is stretched.

Two wires of the same material and of the same length are stretched by longitudinal force, each of the some magnitude. Compare the extension, produced if the radius of the first wire is twice the radius of the second wire