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Due to 10 ampere of current flowing in a circular coil of 10 cm radius, the magnetic field produced at its centre is 3.34
. The number of turns in the coil will be
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(a) 5000 |
(b) 100 |
(c) 50 |
(d) 25 |
An electric motor operates on a 50 volt supply and a current of 12A. If the efficiency of the motor is 30%, what is the resistance of the winding of the motor
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(a) 6 Ω |
(b) 4 Ω |
(c) 2.9 Ω |
(d) 3.1 Ω |
In Young’s double slit experiment, the central bright fringe can be identified
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(a) By using white light instead of monochromatic light |
|
(b) As it is narrower than other bright fringes |
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(c) As it is wider than other bright fringes |
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(d) As it has a greater intensity than the other bright fringes |
Two identical conductors of copper and aluminium are placed in an identical electric fields. The magnitude of induced charge in the aluminium will be
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(a) Zero |
(b) Greater than in copper |
|
(c) Equal to that in copper |
(d) Less than in copper |
The electrical resistance of depletion layer is large because
| (a) It has no charge carriers |
|
(b) It has a large number of charge carriers |
| (c) It contains electrons as charge carriers |
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(d) It has holes as charge carriers |
Which of the following statements is incorrect about hysteresis
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(a) This effect is common to all ferromagnetic substances |
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(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 |
Assertion : If a point charge q is placed in front of an infinite grounded conducting plane surface, the point charge will experience a force.
Reason : This force is due to the induced charge on the conducting surface which is at zero potential.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
Two electric bulbs A and B are rated as 60 W and 100 W. They are connected in parallel to the same source. Then,
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(a) Both draw the same current |
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(b) A draws more current than B |
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(c) B draws more current than A |
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(d) Current drawn are in the ratio of their resistances |