A circular coil of radius 0.01 m has 100 turns and a current 7A. It is suspended freely in a magnetic field 0.2 T. Which position of it will be be in stable equilibrium.

A circular coil of radius 0.01 m has 100 turns and a current 7A. It is suspended freely in a magnetic field 0.2 T. Which position of it will be be in unstable equilibrium? Find potential energy of the coil in both the cases.

A circular coil of 30 turns and radius 8.0 cm carrying a current of 6.0A is suspended vertically in a uniform horizontal magnetic field of magnitude 1.0 .The field lines make an angle of 60^(@) with the normal of the coil. Calculate the magnitude of the counter torque that must be applied to prevent the coil turning.

A vertical circular coil of radius 0.1 m and of 10 turns caries a steady current. When the plane of the coil is normal to the magnetic meridian a neutral point is observed at the centre of the coil . If B_(H)=0.314xx10^(-4)T What is the magnitude of the current flowing through the coil?

For a circular coil of radius R and number of turns N carrying a current I, the magnitude of the magnetic field at a point on its axis at a distance x from its centre is given by B=(mu_(0)IR^(2)N)/(2(x^(2)+R^(2))^(3//2) Consider two parallel co-axis circular coils of equal radius R and number of turns N, carrying equal current in the same direction and separated by a distance R. Show that the field on the axis around the mid-point between the coils is uniform over a distance that is small compared to R and is given by B=0.72 mu_(0) NI//R , approximately. (Such an arrangement to produce a nearly uniform magnetic field over a small region is know as Helmholtz coils).

A circular coil of 30 turns and radius 8.0 cm carrying current of 6.0 A is suspended vertically in a uniform horizontal magnetic field of magnitude 1.0 T. The field lines make an angle of 60^@ with the normal to the coil. Calculate the magnitude of the counter torque, that must be applied to prevent the coil from turning.

A circular coil of 100 turns and of radius 4 cm carries a current of 0.5 A. Find out the magnetic field at the centre of this coil. What will be the percentage fall of this magnetic field at a point on the axis, 3 cm away from the centre?

A rectangular coil of N turns and area of cross section A is held in a magnetic field B=B_0 sin omega t. Deduce an expression for the emf induced in the coil.