NEET-XII-Physics
38: Electromagnetic Induction
- #9Figure shows a conducting loop being pulled out of a magnetic field with a speed v. Which of the four plots shown in figure
(b) may represent the power delivered by the pulling agent as a function of the speed v?
FigureAns : (b) b
The emf developed across the ends of the loop is given by
`` e=Bvl``
If R is the resistance of the loop, then the power delivered to the loop is given by
`` P=\frac{{e}^{2}}{R}=\frac{{B}^{2}{v}^{2}{l}^{2}}{R}``
`` \Rightarrow P\propto {v}^{2}``
This relation is best represented by plot b in the figure.
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