A metallic block carrying current `I` is subjected to a uniform magnetic induction `vec(B) as shown in Figure . The moving charges experience a force ` vec(F) given by ….. Which results in the lowering of the potential of the face ……. Assume the speed of the carries to be `v` .

Options

A. `eVB hatk` , ABCD
B. `eVBhatk` , EFGH
C. `-eVBhatk` , ABCD
D. `-eVBhatk` , EFGH

Answer

A

Explanation

As `vecv = - v_(0) hati`
`vecF = q (vecv xx vecB) implies (hatk) = - (-hati xx hatj)`
As force on electrons is toward ABCD , so face ABCD will have lower potential