- Aconvergent
- Bdivergent
- ✓parallel
- Dcannot say
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The average e.m.f. induced in a coil in which the current changes from 2 ampere to 4 ampere in 0.05 second is 8 volt. What is the self inductance of the coil ?
|
(a) 0.1 H |
(b) 0.2 H |
(c) 0.4 H |
(d) 0.8 H |
Two electric charges 12μC and -6 μC are placed 20 cm apart in air. There will be a point P on the line joining these charges and outside the region between them, at which the electric potential is zero. The distance of P from -6 μC charge is
|
(a) 0.10 m |
(b) 0.15 m |
(c) 0.20 m |
(d) 0.25 m |
The time period of rotation of the sun is 25 days and its radius is 7
. The Doppler shift for the light of wavelength 6000 Å emitted from the surface of the sun will be
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(a) 0.04 Å |
(b) 0.40 Å |
(c) 4.00 Å |
(d) 40.0 Å |
Which of the following statements is incorrect about hysteresis
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(a) This effect is common to all ferromagnetic substances |
|
(b) The hysteresis loop area is proportional to the thermal energy developed per unit volume of the material |
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(c) The hysteresis loop area is independent of the thermal energy developed per unit volume of the material |
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(d) The shape of the hysteresis loop is characteristic of the material |
A lens of power + 2 diopters is placed in contact with a lens of power – 1 diopoter. The combination will behave like
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(a) A divergent lens of focal length 50 cm |
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(b) A convergent lens of focal length 50 cm |
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(c) A convergent lens of focal length 100 cm |
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(d) A divergent lens of focal length 100 cm |
The S.I. unit of magnetic permeability is
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(a) |
(b) Am |
|
(c) |
(d) No unit, it is a dimensionless number |
A power line lies along the east-west direction and carries a current of 10 ampere. The force per metre due to the earth's magnetic field of is
|
(a) |
(b) |
(c) |
(d) |