Questions in Moving Charges and Magnetism

Select	Question
	One Tesla is equal to
	A current carrying wire in the neighborhood produces
	Tesla is the unit of
	The magnetic induction in air at a point 1cm away from a long wire that carries a current of 1A, will be
	The magnetic field at the centre of coil of n turns, bent in the form of a square of side $2l$ ,carrying current $i$, is
	Which of the following gives the value of magnetic field according to, Biot-Savart’s law’
	A toroid has number of turns per unit length n, current i, then the magnetic field is
	Magnetic field due to a ring having n turns at a distance x on its axis is proportional to (if r = radius of ring)
	A and B are two concentric circular conductors of centreO and carrying currents ${I_1}$ and ${i_2}$ as shown in the adjacent figure. If ratio of their radii is $1 : 2$ and ratio of the flux densities at O due to A and B is $1 : 3$, then the value of ${i_1}/{i_2}$ is
	A long straight wire carries an electric current of 2A. The magnetic induction at a perpendicular distance of 5m from the wire is