Explanation:
Oersted conducted an experiment to study the magnetic effect of electric current. In this experiment he observed the deflections of a compass needle placed in close proximity of an electric wire carrying current.
He observed that in the absence of current the needle came to rest in Earths North-south direction under the influence of Earths magnetic field.
However, when the needle was kept in close proximity of an electric wire carrying current it showed deflections in the east and west direction depending on the direction of current.
Thus, indicating that the strength and direction of the magnetic field depends on the magnitude and direction of the current.
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When light rays from the sun fall on a convex lens along a direction parallel to its axis
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(a) Focal length for all colours is the same |
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(b) Focal length for violet colour is the shortest |
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(c) Focal length for yellow colour is the longest |
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(d) Focal length for red colour is the shortest |
Assertion : The whole charge of a conductor cannot be transferred to another isolated conductor.
Reason : The total transfer of charge from one to another is not possible.
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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. |
To make the field radial in a moving coil galvanometer
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(a) The number of turns in the coil is increased |
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(b) Magnet is taken in the form of horse-shoe |
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(c) Poles are cylindrically cut |
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(d) Coil is wounded on aluminium frame |