The bar in the figure falls vertically while maintaining electrical contact with

Question

The bar in the figure falls vertically while maintaining electrical contact with the rails. The rail spacing is 33 , and the field strength is B= 2.0 T....Part (a) was: If the bar drops from rest, what's the magnitude of the induced emf after it's been falling for 0.6 ? (You may assume that the magnetic force on the falling bar is much less than the bar's weight.)..and I got the correct answer or 4 V ......**Part (b) I cannot get : If the bar drops from rest, what's the magnitude of the induced emf after it's been falling for 1.0 ? (I came up with 6V but it wasn't correct)

Explanation / Answer

after the 0.6s the velocity is

(v = u+gt = 10 imes 0.6 = 6)

E= Blv

33x2x6 = 396 or 400

there might be problum of unit because u haven't given the units. may be length is in cm then it's

4V

b) by the eq 1

(v_b = 10 imes 1 = 10)

E = 33x2x10 = 660

so 6.6V

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