- AExerts a force on it
- BTransfer energy to it
- CTransfers momentum to it
- DTransfers impules to it
Explanation:
The emitted X-rays transfer energy to the material on which it is falling.
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The coil of dynamo is rotating in a magnetic field. The developed induced e.m.f. changes and the number of magnetic lines of force also changes. Which of the following condition is correct
|
(a) Lines of force minimum but induced e.m.f. is zero |
|
(b) Lines of force maximum but induced e.m.f. is zero |
|
(c) Lines of force maximum but induced e.m.f. is not zero |
|
(d) Lines of force maximum but induced e.m.f. is also maximum |
In a transformer, the number of turns in primary and secondary are 500 and 2000 respectively. If current in primary is 48 A, the current in the secondary is
|
(a) 12 A |
(b) 24 A |
(c) 48 A |
(d) 144 A |
A cell is connected between two points of a uniformly thick circular conductor. The magnetic field at the centre of the loop will be (Here and
are the currents flowing in the two parts of the circular conductor of radius ‘a’ and
has the usual meaning)
|
(a) Zero |
(b) |
(c) |
(d) |
Which of the following is an amorphous solid
|
(a) Glass |
(b) Diamond |
(c) Salt |
(d) Sugar |
A rectangular coil 20 cm × 20 cm has 100 turns and carries a current of 1 A. It is placed in a uniform magnetic field B = 0.5 T with the direction of magnetic field parallel to the plane of the coil. The magnitude of the torque required to hold this coil in this position is
|
(a) Zero |
(b) 200 N-m |
(c) 2 N-m |
(d) 10 N-m |
The internal resistance of a cell is the resistance of
|
(a) Electrodes of the cell |
(b) Vessel of the cell |
|
(c) Electrolyte used in the cell |
(d) Material used in the cell |