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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Consider two point charges of equal magnitude and opposite sign separated by a certain distance. The neutral point due to them
|
(a) Does not exist |
|
(b) Will be in mid way between them |
|
(c) Lies on the perpendicular bisector of the line joining the two |
|
(d) Will be closer to the negative charge |
A long copper tube of inner radius R carries a current i. The magnetic field B inside the tube is
|
(a) |
(b) |
(c) |
(d) Zero |
Statement-II: For heavy nuclei, binding energy per nucleon increases with increasing Z. while for light nuclei it decreases with increasing Z.
Consider the following statements A and B and identify the correct choice of the given answers
A : The width of the depletion layer in a P-N junction diode increases in forwards bias
B : In an intrinsic semiconductor the fermi energy level is exactly in the middle of the forbidden gap
|
(a) A is true and B is false |
(b) Both A and B are false |
|
(c) A is false and B is true |
(d) Both A and B are true |
A coil of inductance L is carrying a steady current i. What is the nature of its stored energy
|
(a) Magnetic |
(b) Electrical |
|
(c) Both magnetic and electrical |
(d) Heat |
In a step up transformer, if ratio of turns of primary to secondary is 1 : 10 and primary voltage is 230 V. If the load current is 2A, then the current in primary is
|
(a) 20 A |
(b) 10 A |
(c) 2 A |
(d) 1 A |
