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Q.

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
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a

d

b

a

c

c

d

b

answer is B.

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Detailed Solution

P = Fv = Bil \times v = B\,\left( {\frac{{Bvl}}{R}} \right)\;l \times v = \frac{{{B^2}{v^2}{l^2}}}{R} \Rightarrow P \propto {v^2}

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