Electromagnetic...

Two circular coils can be arranged in any of the three situations shown in the figure. Their mutual inductance will be

A conducting rod of length l is rotating with constant angular velocity $$\omega$$ about an axis O' in a uniform magnetic field B as shown in figure. The emf induced between ends P and Q will be (the axis is parallel to B)

A simple pendulum with bob of mass $$m$$ and conducting wire of length $$L$$ swings under gravity through an angle $$2\theta$$. The earth's magnetic field component in the direction perpendicular to swing is $$B$$.The maximum potential difference induced across the pendulum is:

A metallic square loop is moving in its own plane with velocity $$v$$ in a uniform magnetic field perpendicular to its plane as shown in the figure. An electric field is induced

A long solenoid has $$500\ turns$$. When a current of $$2\ A$$ is passed through it, the resulting magnetic flux linked with each turn of the solenoid is $$4 \times {10}^{-3}\ Wb$$. The self-inductance of the solenoid is:

A solid conducting sphere of radius $$R$$ is moved with a velocity $$V$$ in a uniform magnetic field of strength $$B$$ such that $$\bar { B }$$ is perpendicular to $$\bar {V}$$. The maximum e.m.f. induced between two points of the sphere is :

The armature of a generator of resistance $$1\Omega$$ is rotated at its rated speed and produces $$125V$$ without load and $$115V$$ with full load. The current in the armature coil is

A circular coil  of mean radius of 7 cm and having 4000 tums is rotated at the rate of 1800 revolutions per minute in the earth's magnetic field (B = 0.5 Gauss ) , The peak value of emf induced is

A rod of length $$50\ cm$$ moves with a speed of $$10\ cm/s$$, in a uniform magnetic field of strength $$10\ G$$ at an angle of $$30^{o}$$ with the field. The emf induced across the ends of the rod is :

The magnetic flans associated with a metal ring varies with time all. to $$\phi = 3 (at^3 - bt^2)$$ $$Tm^2, a = 2sec^{-3}, b = 6sec^{-2}$$. If the resistance of the ring is $$24 \Omega$$, the current induced in the ring during the time $$t = 2$$ sec is