Explanation:
An anticlockwise current-pulse generated and then a clock-wise current pulse.
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If a piece of metal was thought to be magnet, which one of the following observations would offer conclusive evidence
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(a) It attracts a known magnet |
(b) It repels a known magnet |
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(c) Neither (a) nor (b) |
(d) It attracts a steel screw driver |
A charge particle is free to move in an electric field. It will travel
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(a) Always along a line of force |
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(b) Along a line of force, if its initial velocity is zero |
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(c) Along a line of force, if it has some initial velocity in the direction of an acute angle with the line of force |
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(d) None of the above |
In the figure, shown the magnetic induction at the centre of there arc due to the current in portion AB will be
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(a) |
(b) |
(c) |
(d) Zero |
In Millikan's experiment for the determination of the charge on the electron, the reason for using the oil is
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(a) It is a lubricant |
(b) Its density is higher |
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(c) It vapourises easily |
(d) It does not vapourise |
Which is the correct diagram of a half-wave rectifier
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(a)
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(b)
|
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(c)
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(d)
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