Alternating CurrentHard
Question
A shorticircuited coil is placed in a time verying magnetic field. Electric power is disspated due to the current induced in the coul. If the number of turns were to be quadrupled (four times) and the wire radius halved, the electrical power dissipated would be
Options
A.halved
B.the same
C.doubled
D.quadrupled
Solution
Power 
Here, e = induced emf =
e = - NA
Also,
where R = resistance, r = radius, l = length.
∴ P ∝ N2r2
∴
Here, e = induced emf =
e = - NA
Also,
where R = resistance, r = radius, l = length.
∴ P ∝ N2r2
∴
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