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 are incident on a prism at an angle of 45°, the minimum deviation is obtained. If refractive index of the material of prism is 
, then the angle of prism will be
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(a) 30° |
(b) 40° |
(c) 50° |
(d) 60° |
In Bohr’s model, if the atomic radius of the first orbit is 
, then the radius of the fourth orbit is
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(a) |
(b) 4 |
(c) |
(d) 16 |
When 2 amperes current is passed through a tangent galvanometer, it gives a deflection of 30o. For 60o deflection, the current must be
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(a) 1 amp |
(b) 2 |
(c) 4 amp |
(d) 6 amp |
Express which of the following setups can be used to verify Ohm’s law
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(a)
|
(b)
|
(c)
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(d)
|
The line joining the pole and the centre of curvature of a mirror is called the:
Assertion : Electrons move away from a low potential to high potential region.
Reason : Because electrons has negative charge
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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. |
Two long parallel wires P and Q are both perpendicular to the plane of the paper with distance 5 m between them. If P and Q carry current of 2.5 amp and 5 amp respectively in the same direction, then the magnetic field at a point half way between the wires is
|
(a) |
(b) |
(c) |
(d) |
A bar magnet of magnetic moment 
is placed in a magnetic field of induction 
. The torque exerted on it is
|
(a) |
(b) - |
(c) |
(d) |
The magnitude and direction of the current in the circuit shown will be
|
(a) |
(b) |
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(c) 1 A from b to a through e |
(d) 1 A from a to b through e |
