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Physics-

General

Easy

Question

Figure (i) shows a conducting loop being pulled out of a magnetic field with a speed $v$ . Which of the four plots shown in figure (ii) may represent the power delivered by the pulling agent as a function of the speed $v$

$a$
$b$
$c$
$c$ '/>

The correct answer is: $b$

$P equals F v equals B i l cross times v equals B blank open parentheses fraction numerator B v l over denominator R end fraction close parentheses l cross times v equals fraction numerator B to the power of 2 end exponent v to the power of 2 end exponent l to the power of 2 end exponent over denominator R end fraction rightwards double arrow P proportional to v to the power of 2 end exponent$

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