- AStationary.
- BNo.
- CAttractive.
- DAll.
Explanation:
The stationary charge (i.e static electricity) is produced by friction.
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A particle moving in a magnetic field increases its velocity, then its radius of the circle
|
(a) Decreases |
(b) Increases |
(c) Remains the same |
(d) Becomes half |
A 100 turns coil shown in figure carries a current of 2 amp in a magnetic field . The torque acting on the coil is
|
(a) 0.32 Nm tending to rotate the side AD out of the page |
|
(b) 0.32 Nm tending to rotate the side AD into the page |
|
(c) 0.0032 Nm tending to rotate the side AD out of the page |
|
(d) 0.0032 Nm tending to rotate the side AD into the page |
A rectangular coil ABCD is rotated anticlockwise with a uniform angular velocity about the axis shown in diagram below. The axis of rotation of the coil as well as the magnetic field B are horizontal. The induced e.m.f. in the coil would be maximum when

| (a) The plane of the coil is horizontal |
|
(b) The plane of the coil makes an angle of 45° with the magnetic field |
|
(c) The plane of the coil is at right angles to the magnetic field |
|
(d) The plane of the coil makes an angle of 30° with the magnetic field |
Four modifications are suggested in the lens formula to include the effect of the thickness t of the lens. Which one is likely to be correct?
The capacitance of a parallel plate condenser does not depend on
|
(a) Area of the plates |
(b) Medium between the plates |
|
(c) Distance between the plates |
(d) Metal of the plates |
A magnifying glass is to be used at the fixed object distance of 1 inch. If it is to produce an erect image magnified 5 times its focal length should be
|
(a) 0.2 inch |
(b) 0.8 inch |
(c) 1.25 inch |
(d) 5 inch |
The resistance of a galvanometer is 25 ohm and it requires 50μA for full deflection. The value of the shunt resistance required to convert it into an ammeter of 5 amp is
|
(a) 2.5 |
(b) 1.25 |
(c) 0.05 ohm |
(d) 2.5 ohm |