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Consider two different metallic strips (1 and 2) of the same material. Their lengths are the same, widths are w 1 and w 2 and thicknesses are d 1 and d 2 , respectively. Two points K and M are symmetrically located on the opposite faces parallel to the x-y plane (see figure). V 1 and V 2 are the potential differences between K and M in strips 1 and 2, respectively. Then, for a given current I flowing through them in a given magnetic field strength B, the correct statement(s) is(are)

1. If w 1 = w 2 and d 1 = 2d 2 , then V 2 = 2V 1
2. If w 1 = w 2 and d 1 = 2d 2 , then V 2 = V 1
3. If w 1 = 2w 2 and d 1 = d 2 , then V 2 = 2V 1
4. If w 1 = 2w 2 and d 1 = d 2 , then V 2 = V 1

Correct answer: If w 1 = w 2 and d 1 = 2d 2 , then V 2 = 2V 1

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