- 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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Assertion : A P-N photodiode is made from a semiconductor for which Eg = 2.8 eV. This photo diode will not detect the wavelength of 6000 nm.
Reason : A PN photodiode detect wavelength l if
.
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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. |
As shown in the figure, a magnet is moved with a fast speed towards a coil at rest. Due to this induced electromotive force, induced current and induced charge in the coil is E, I and Q respectively. If the speed of the magnet is doubled, the incorrect statement is

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(a) E increases |
(b) I increases |
(c) Q remains same |
(d) Q increases |
The torque on a bar magnet due to the earth's magnetic field is maximum when the axis of the magnet is
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(a) Perpendicular to the field of the earth |
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(b) Parallel to the vertical component of the earth's field |
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(c) At an angle of 33o with respect to the N-S direction |
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(d) Along the North-South (N-S) direction |
Which of the following has a negative temperature coefficient
|
(a) C |
(b) Fe |
(c) Mn |
(d) Ag |
A dip needle lies initially in the magnetic meridian when it shows an angle of dip q at a place. The dip circle is rotated through an angle x in the horizontal plane and then it shows an angle of dip . Then
is
|
(a) |
(b) |
(c) |
(d) cos x |
An electron in the n = 1 orbit of hydrogen atom is bound by 13.6 eV energy is required to ionize it is
|
(a) 13.6 eV |
(b) 6.53 eV |
(c) 5.4 eV |
(d) 1.51 eV |
The magnitude of electric field intensity E is such that, an electron placed in it would experience an electrical force equal to its weight is given by
|
(a) mge |
(b) |
(c) |
(d) |