- AClose to the valence band of the host crystal.
- BClose to conduction band of the host crystal.
- CBelow the conduction band of the host crystal.
- DAbove the conduction band of the host crystal.
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A stream of electrons is projected horizontally to the right. A straight conductor carrying a current is supported parallel to electron stream and above it. If the current in the conductor is from left to right then what will be the effect on electron stream
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(a) The electron stream will be pulled upward |
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(b) The electron stream will be pulled downward |
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(c) The electron stream will be retarted |
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(d) The electron beam will be speeded up towards the right |

An equiconvex lens is cut into two halves along (i) XOX¢ and (ii) YOY¢ as shown in the figure. Let f, f ¢, f ¢¢ be the focal lengths of the complete lens, of each half in case (i), and of each half in case (ii), respectively
Choose the correct statement from the following
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(a) |
(b) |
(c) |
(d) |
A non-planar loop of conducting wire carrying a current I is placed as shown in the figure. Each of the straight sections of the loop is of length 2a. The magnetic field due to this loop at the point P (a,0,a) points in the direction

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(a) |
(b) |
(c) |
(d) |