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The root-mean-square (r.m.s.) value of the voltage of a sinusoidal alternating supply is . The frequency of the supply is . Derive an expression for the variation with time (in second) of the potential difference (in volt) of the supply.
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. The frequency of the supply is 
. Derive an expression for the variation with time 
(in second) of the potential difference 
(in volt) of the supply.
