Electromagnetic Induction Test

Result

Electromagnetic Induction Test - 7

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Question 1
1 / -0

In a transformer, loss due to eddy currents is minimised by

A
laminating the transformer

B
laminating the core of steel

C
increasing the number of turns of primary coil

D
lubricating the core

Solution

When magnetic flux linked with a coil changes, induced emf is produced in it and the induced current flows through the wire forming the coil. In 1895, Focault experimentally found that these induced currents are set up in the conductor in the form of closed loops. These currents look like eddies or whirlpools and likewise are known as eddy currents. They are also known as Focault's currents. These current oppose the cause of their origin. Therefore, due to eddy currents, a great amount of energy is wasted in form of heat energy. To minimise these current, the core of transformer should be laminated.
Question 2
1 / -0

A conducting square loop of side l and resistance R moves in its own plane with uniform velocity v perpendicular to one of its sides. A magnetic field H, constant in time and space, is pointing perpendicular and into the plane of the loop everywhere. The current induced in the loop is

A
(H l v)/R anti-clockwise

B
(H l v)/R clockwise

C
(2 H l v)/R anti-clockwise

D
zero

Solution

Induced emf in the loop will be zero because the magnetic flux linked with the coil remains the same and hence, induced current in the loop will be zero.