A conducting bar moves on two conducting rails as shown in the figure. A constant magnetic field B exists into the page. The bar starts to move from the vertex at time $t = 0$ with a constant velocity. If the induced EMF is $E \propto t^{n}$ , then value of n is _.

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As the bar moves without change in orientation, the length of bar will be proportional to its distance from the vertex. i.e. I = c ( v t ) ​ induced emf E = B / v = c B v 2 t ​ ⇒ n = 1

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