Physics

Problem

A straight rod

AB

of length

0.50\,\text{m}

lies on two parallel conducting rails that run north–south. The rails are joined at their ends, forming a closed rectangular circuit. A uniform vertical magnetic field of

0.40\,\text{T}

is directed downward. The rod is pulled eastward with a steady speed of

3.0\,\text{m\,s}^{-1}

. Which statement about the polarity of the rod is correct? a) End

A

(north) is at a higher potential than end

B

(south) b) Both ends remain at the same potential c) End

B

(south) is at a higher potential than end

A

(north) d) The polarity reverses periodically between the ends

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