- Awhen electric field is changing in the circuit
- Bwhen magnetic field is changing in the circuit
- Cin both types of fields
- Dthrough wires and resistance only
Explanation:
Displacement current is a quantity appearing in Maxwell's equations that is defined in terms of the rate of change of electric displacement field.
When electric field is changing with time continuously, the displacement current is constant.
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In an electron gun, the electrons are accelerated by the potential V. If e is the charge and m is the mass of an electron, then the maximum velocity of these electrons will be
|
(a) |
(b) |
(c) |
(d) |
A concave lens of focal length 20 cm placed in contact with a plane mirror acts as a
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(a) Convex mirror of focal length 10 cm |
|
(b) Concave mirror of focal length 40 cm |
|
(c) Concave mirror of focal length 60 cm |
|
(d) Concave mirror of focal length 10 cm |
A 10
capacitor and a 20
capacitor are connected in series across a 200 V supply line. The charged capacitors are then disconnected from the line and reconnected with their positive plates together and negative plates together and no external voltage is applied. What is the potential difference across each capacitor
|
(a) |
(b) |
(c) 400 V |
(d) 200 V |
The half-life of
is 5 days. What time is taken by (7/8)th part of the sample to decay
|
(a) 3.4 days |
(b) 10 days |
(c) 15 days |
(d) 20 days |
Use of eddy currents is done in the following except
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(a) Moving coil galvanometer |
(b) Electric brakes |
|
(c) Induction motor |
(d) Dynamo |
A current I flows along the length of an infinitely long, straight and thin-walled pipe. Then
|
(a) The magnetic field at all points inside the pipe is the same but not zero |
|
(b) The magnetic field at any point inside the pipe is zero |
|
(c) The magnetic field is zero only on the axis of the pipe |
|
(d) The magnetic field is different at different points inside the pipe |
A star is moving towards the earth with a speed of 4.5 m/s. If the true wavelength of a certain line in the spectrum received from the star is 5890 Å, its apparent wavelength will be about [c = 3
]
|
(a) 5890 Å |
(b) 5978 Å |
(c) 5802 Å |
(d) 5896 Å |