- ✓$M=-\frac{L}{f_{0}}(1+\frac{D}{f_{e}})$
- B$M=-\frac{f_{0}}{L}(1+\frac{D}{f_{e}})$
- C$M=(1+\frac{D}{f_{e}})$
- D$M=(1-\frac{D}{f_{e}})$
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A current carrying circular loop is freely suspended by a long thread. The plane of the loop will point in the direction
|
(a) Wherever left free |
(b) North-south |
|
(c) East-west |
(d) At 45° with the east-west direction |
Ratio of magnetic intensities for an axial point and a point on broad side-on position at equal distance d from the centre of magnet will be or The magnetic field at a distance d from a short bar magnet in longitudinal and transverse positions are in the ratio
| (a) 1 : 1 | (b) 2 : 3 | (c) 2 : 1 | (d) 3 : 2 |
A coil of 100 turns and area 5 square centimetre is placed in a magnetic field B = 0.2 T. The normal to the plane of the coil makes an angle of 60° with the direction of the magnetic field. The magnetic flux linked with the coil is
|
(a) 5 |
(b) 5 |
(c) |
(d) |
Which of the following statement is true
|
(a) |
(b) |
|
(c) |
(d) |
According to photon theory of light which of the following physical quantities associated with a photon do not/does not change as it collides with an electron in vacuum
|
(a) Energy and momentum |
(b) Speed and momentum |
|
(c) Speed only |
(d) Energy only |