A conducting rod of length 2l is rotating with constant angular speed w about its perpendicular bisector. A uniform magnetic field 
exists parallel to the axis of rotation. The e.m.f. induced between two ends of the rod is
|
(a) Bω |
(b) |
(c) |
(d) Zero |
(d) Zero
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A cube of side l is placed in a uniform field E, where E = E
. The net electric flux through the cube is
|
(a) Zero |
(b) |
(c) 4 |
(d) 6 |
The ratio of the refractive index of red light to blue light in air is
|
(a) Less than unity |
|
(b) Equal to unity |
|
(c) Greater than unity |
|
(d) Less as well as greater than unity depending upon the experimental arrangement |
Assertion : Magnetic moment of an atom is due to both, the orbital motion and spin motion of every electron.
Reason : A charged particle produces a magnetic field.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
Magnetic moments of two bar magnets may be compared with the help of
| (a) Deflection magnetometer | (b) Vibration magnetometer |
| (c) Both of the above | (d) None of the above |
Two identical heaters rated 220 volt, 1000 watt are placed in series with each other across 220 volt lines. If resistance do not change with temperature, then the combined power is
|
(a) 1000 watt |
(b) 2000 watt |
(c) 500 watt |
(d) 4000 watt |
