a square loop initially kept away from the region of magnetic field .then it is moved towards the right with a constant velocity and goes out of the field.plot the graph showing the variation of
1)magnetic flux through the loop with time
2)induced emf in the loop with time
 

Asked by modi72879 | 21st Nov, 2017, 04:51: PM

Expert Answer:

When the loop is far away from magnetic field, flux is zero. when the loop entering the magnetic field region, flux increases from zero
to a constant value, then remains constant when it is moving in the field region. During exit time, the flux decreases from constant value to zero.
 
Induced emf is given by
begin mathsize 12px style epsilon space equals space minus fraction numerator d ϕ over denominator d t end fraction end style, where ε is induced emf and φ is flux
When the loop is far away, the flux is zero and emf also zero. When the loop entering field region, the change in flux gives induced emf.
At the entrance change in flux is positive, hence induced emf is negative.
when the loop is well inside the field region, since flux remains constant, change in flux is zero, hence emf also zero.
when loop is exiting the field region again change in flux gives induced emf. Here change in flux is negative, hence induced emf is positive.

Answered by  | 27th Nov, 2017, 03:42: PM

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