EASY
12th Rajasthan Board
IMPORTANT
Earn 100
The energy density in a magnetic field is proportional to the square of the magnitude of the magnetic field.
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Important Questions on Electromagnetic Induction
MEDIUM
12th Rajasthan Board
IMPORTANT
Define coefficient of mutual induction.
EASY
12th Rajasthan Board
IMPORTANT
Define coefficient of self induction and state its units.
EASY
12th Rajasthan Board
IMPORTANT
Name the unit of self inductance in SI system.
HARD
12th Rajasthan Board
IMPORTANT
State and explain eddy currents .
MEDIUM
12th Rajasthan Board
IMPORTANT
What are eddy currents? Write down their two uses. How unwanted eddy currents are reduced in transformers?
HARD
12th Rajasthan Board
IMPORTANT
Mention the disadvantages of eddy currents.
HARD
12th Rajasthan Board
IMPORTANT
A rectangular wire loop of sides and with a small cut is moving out of a region of uniform magnetic field of magnitude directed normal to the loop. What is the emf developed across the cut if the velocity of the loop is in a direction normal to the longer side of the loop? For how long does the induced voltage last in this case?
MEDIUM
12th Rajasthan Board
IMPORTANT
A long metallic rod is rotated with an angular frequency of about an axis normal to the rod passing through its one end. The other end of the rod is in contact with a circular metallic ring. A constant and uniform magnetic field of parallel to the axis exists everywhere. Calculate the emf developed between the centre and the ring
