Question

A 20 volts ac is applied to a circuit consisting of a resistance and a coil with negligible resistance. If the voltage across the resistance is 12 V, the voltage across the coil is
(a) 16 volts(b) 10 volts(c) 8 volts(d) 6 volts

Answer 1

answer : option (a) 16 volts


explanation :- Here you should understand that, an alternating current is applied to circuit consisting of a resistance and a coil. here coil can be assumed $\textbf{inductor}$

hence, L - R combination of circuit is given .

The voltage across a L - R combination is given by $V^2=V_R^2+V_L^2$

where V = 20 volts , $V_R$ = 12volts

so, $V_L=\sqrt{V^2-V_R^2}=\sqrt{20^2-12^2}$

= √{400 - 144} volts

= √256 volts = 16 volts

hence, the voltage across the coil is 16 volts .

Answer 2

Answer:

answer is this for this questio.

hope it will help u