Questions
A short-circuited coil is placed in a time-varying magnetic field. Electrical power is dissipated due to the current induced in the coil. If the number of turns were to be
quadrupled and the wire radius halved, the electrical power dissipated would be,
detailed solution
Correct option is B
Power P=ε2R hence ε=−dφdt where φ=NBA∴ ε=−NAdBdt Also R∝lr2∝Nr2 where R= resistance, r= radius, l= length ∴ P∝N2r2N∝Nr2N becomes quadrupled and radius is halved.⇒P1P2=1Talk to our academic expert!
Similar Questions
A square wire loop, of side a has a long straight wire carrying a constant current i that passes through the centre of the loop and perpendicular to its plane as shown in Fig.
The current induced in the square loop is
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