Electromagnetic...

The two rails of a railway track, insulated from each other and the ground, are connected to millivoltmeter. What is the reading of the millivoltmeter when a train passes at a speed of 180 km/hr along the track, given that the vertical component of earth's magnetic field is $$0.2\times 10^{-4}wb/m^2$$ and rails are separated by 1 metre

A metal rod moves at a constant velocity in a direction perpendicular to its length. A constant uniform magnetic field exists in space in a direction perpendicular to the rod as well its velocity. Select correct statements (s) from the following

A metal conductor of length 1 m rotates vertically about one of its ends at angular velocity 5 radians per second. If the horizontal component of earth's magnetic field is $$0.2\times 10^{-4}T$$, then the e.m.f developed between the two ends of the conductor is

The flux linked with a coil at any instant 't' is given by $$\phi=10t^2-50t+250$$. The induced emf at $$t=3s$$ is

The dimensions of self inductance are

A conducting rod is rotating about one end in a plane perpendicular to a uniform magnetic field with constant angular velocity. The correct graph between the induced emf($$e$$) across the rod and time ($$t$$) is

A solenoid that is highly wound with wire of diameter $$0.10cm$$ has a cross-sectional area $$0.90{cm}^{2}$$ and is $$40cm$$ long. Calculate the self inductance of the solenoid.

A solenoid that is highly wound with wire of diameter $$0.10cm$$ has a cross-sectional area $$0.90{cm}^{2}$$ and is $$40cm$$ long. If the current through the solenoid decreases uniformly from $$10A$$ to $$0A$$ in $$0.10s$$, what is the emf induced between the ends of the solenoid?

When a loop moves towards a stationary magnet with speed $$v$$, the induced emf in the loop is $$E$$. If the magnet also moves away from the loop with the same speed, then the emf induced in the loop is 

A conducting straight wire $$PQ$$ of length $$l$$ is fixed along a diameter of a non-conducting ring as shown in the figure. The ring is given a pure rolling motion on a horizontal surface such that its centre of mass has a veleocity $$v$$. There exists a uniform horizontal magnetic field $$B$$ in horizontal direction perpendicular to the plane of ring. The magnitude of induced emf in the wire $$PQ$$ at the position shown in the figure will be :