EASY
12th ICSE
IMPORTANT
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What are eddy currents?

Important Questions on Electromagnetic Induction

EASY
12th ICSE
IMPORTANT
Why is the core of a transformer laminated?
EASY
12th ICSE
IMPORTANT
A current-carrying circular loop is free to turn in a uniform external magnetic field. What is its orientation of stable equilibrium? Show that in this orientation, the flux of the external field plus the flux of the field produced by the loop is maximum?
EASY
12th ICSE
IMPORTANT
A current-carrying loop of irregular shape is located in an external magnetic field. If the wire is flexible, it takes a circular shape. Why?
MEDIUM
12th ICSE
IMPORTANT
A circular conducting loop of radius a and resistance R is placed with the plane perpendicular to a time-varying magnetic field B=B0 sin ωt. Obtain expression for the current induced in the loop.
EASY
12th ICSE
IMPORTANT
How can a space-traveller detect the presence of magnetic field on an unknown planet with the help of a sensitive galvanometer and a coil of wire?
EASY
12th ICSE
IMPORTANT
As soon as current is switched on in a high-voltage wire, the bird sitting on it flies away, why?
EASY
12th ICSE
IMPORTANT
A coil is removed from a magnetic field (a) rapidly, (b) slowly. In which case more work will be done?
EASY
12th ICSE
IMPORTANT
As the speed of bicycle is increased, the illumination of its lamp increases. Why?