A current carrying circular coil of 100 turns and radius 5.0 cm produces a magnetic field of 6.0 × 10^–3 T at its centre. Find the value of the current.

A square loop PQRS carrying a current of 6.0 A is placed near long wire carrying 10 A as shown in figure (35-E10). A Show that the magnetic force acting on the part PQ is equal and opposite to that on the part RS. B Find the magnetic force on the square loop.

A circular loop of one turn carries a current of 5.00 A. If the magnetic field B at the centre is 0.200 mT, find the radius of the loop.

An electron makes 3 × 10⁵ revolutions per second in a circle of radius 0.5 angstrom. Find the magnetic field B at the centre of the circle.

A conducting circular loop of radius a is connected to two long, straight wires. The straight wires carry a current i as shown in figure. Find the magnetic field B at the centre of the loop.