- AAre from N-pole to S-pole of magnet.
- BDo not exist.
- CDepend upon the area of cross section of bar magnet.
- DAre from S-pole of magnet.
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A photon of wavelength 4400 Å is passing through vacuum. The effective mass and momentum of the photon are respectively
|
(a) 5 |
(b) 5 |
|
(c) Zero, 1.5 |
(d) 5 |
An iron rod of volume and relative permeability 1000 is placed inside a long solenoid wound with 5 turns/cm. If a current of 0.5 A is passed through the solenoid, then the magnetic moment of the rod is
|
(a) 10 |
(b) 15 |
(c) 20 |
(d) 25 |
A tall man of height 6 feet, want to see his full image. Then required minimum length of the mirror will be-
The figure shows a network of currents. The magnitude of currents is shown here. The current I will be

|
(a) 3 A |
(b) 9 A |
(c) 13 A |
(d) 19 A |
X-rays which can penetrate through longer distances in substance are called
|
(a) Soft X-rays |
(b) Continuous X-rays |
(c) Hard X-rays |
(d) None of the above |