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=e2R; hence e=−dϕdt where ϕ=NBA∴e=−NAdBdt Also R∝lr2As number of turns increases, the length of wire also increase.l∝NWhere R = resistance, r = radius, l = Length ∴P∝N2r2l∝Nr2⇒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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