A rectangular loop carrying a current i is situated near a long straight wire such that the wire is parallel to the one of the sides of the loop and is in the plane of the loop. If a steady current I is established in wire as shown in figure, the loop will
| (a) Rotate about an axis parallel to the wire |
| (b) Move away from the wire or towards right |
| (c) Move towards the wire |
| (d) Remain stationary |
(c) Move towards the wire
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Time period for a magnet is T. If it is divided in four equal parts along its axis and perpendicular to its axis as shown then time period for each part will be
| (a) 4T | (b) T/4 | (c) T/2 | (d) T |
When light is incident on a doubly refracting crystal, two refracted rays-ordinary ray (O-ray) and extra ordinary ray (E-ray) are produced. Then
|
(a) Both O-ray and E-ray are polarised perpendicular to the plane of incidence |
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(b) Both O-ray and E-ray are polarised in the plane of incidence |
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(c) E-ray is polarised perpendicular to the plane of incidence and O-ray in the plane of incidence |
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(d) E-ray is polarised in the plane of incidence and O-ray perpendicular to the plane of incidence |
If the light moving in a straight line bends by a small but fixed angle, it may be a case of: