Moving Charges ...

A ring of radius R, made of an insulating material carries a charge Q uniformly distributed on it. If the ring rotates about the axis passing through its centre and normal to plane of the ring with constant angular speed ω, then the magnitude of the magnetic moment of the ring is

What will be the resultant magnetic field at origin due to four infinite length wires if each wire produces magnetic field \'B\' at origin

The ratio of the magnetic field at the centre of a current carrying circular wire and the magnetic field at the centre of a square coil made from the same length of wire will be

Two infinite length wires carry currents 8 A and 6 A respectively and are placed along X and Y–axis. Magnetic field at a point P(0, 0, d)m will be

Figure shows a square loop ABCD with edge length a. The resistance of the wire ABC is r and that of ADC is 2 r. The value of magnetic field at the centre of the loop assuming uniform wire is

Figure shows the cross-sectional view of the hollow cylindrical conductor with inner radius ‘R’ and outer radius ‘2R’ Cylinder is carrying uniformly distributed current along it’s axis. The magnetic induction at point ‘P’ at a distance 3R/2from the axis of the cylinder will be

A long wire AB is placed on a table. Another wire PQ of mass 1.0 g and length 50 cm is set to slide on two rails PS and QR. A current of 50 A is passed through the wires. At what distance above AB, will the wire PQ be in equilibrium

An infinitely long straight conductor AB is fixed and a current is passed through it. Another movable straight wire CD of finite length and carrying current is held perpendicular to it and released. Neglect weight of the wire

Two thick wires and two thin wires, all of the same materials and same length form a square in the three different ways P, Q and R as shown in the fig. with current connection shown. The magnetic field at the centre of the square is zero in cases