
A rod is rotating times per second about an axis passing through one of its ends . Its linear charge density is varying with distance as , where is positive constant and is the total length of the rod. Find the net magnetic moment of the rod.


Important Questions on Magnetic Effect of Current





The ratio of the magnetic field at the centre of a current-carrying circular coil to magnetic moment is . If the current and the radius both are doubled. The new ratio will become


A uniform conducting wire of length and resistance is wound up as a current-carrying coil in the shape of,
(i) an equilateral triangle of side .
(ii) a square of side .
The magnetic dipole moments of the coil in each case respectively are:







A particle of mass and charge is moving in a circle of radius with speed , where speed of light. The ratio of the magnetic moment of the particle to its angular momentum is



A wire carrying current is bent in the shape as shown, where rectangle and are perpendicular to each other. If the sides of the rectangles are of lengths and , then the magnitude and direction of magnetic moment of the loop is :



