- AStationary magnetic field
- BConduction current
- CEddy current
- DDisplacement current
Explanation:
By Maxwell
$\text{I}_\text{d}=\frac{\in\text{dE}}{\text{dt}}$
dE is electric field
Id is displacement current per unit area.
Hence changing electric field gives displacement current.
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Assertion : Faraday’s laws are consequences of conservation of energy.
Reason : In a purely resistive ac circuit, the current lags behind the e.m.f. in phase.
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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. |
Assertion : An electric field is preferred in comparison to magnetic field for detecting the electron beam in a television picture tube.
Reason : Electric field require low voltage.
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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. |
$\text{m}\omega^2\text{l}$
$\text{Zero.}$
$\text{mg}$
$\frac{1}{2}\text{m}\omega^2\text{l}$
Two concave lenses L1 and L2 are kept in contact with each other. If the space between the two lenses is filled with a material of refractive index $\mu\approx1,$ the magnitude of the focal length of the combination:
The focal length of the objective lens of a compound microscope is
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(a) Equal to the focal length of its eye piece |
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(b) Less than the focal length of eye piece |
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(c) Greater than the focal length of eye piece |
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(d) Any of the above three |
If the ratio of amplitude of two waves is 4 : 3, then the ratio of maximum and minimum intensity is
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(a) 16 : 18 |
(b) 18 : 16 |
(c) 49 : 1 |
(d) 94 : 1 |