- ADecreases in a diamagnetic material.
- BDecreases in a paramagnetic material.
- CDecreases in a ferromagnetic material.
- DRemains the same in a diamagnetic material.
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A 60 watt bulb is hung over the center of a table 4 m × 4 m at a height of 3 m. The ratio of the intensities of illumination at a point on the centre of the edge and on the corner of the table is
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(a) |
(b) 2 / 1 |
(c) 17 / 13 |
(d) 5 / 4 |
Between the plates of a parallel plate condenser there is 1mm thick paper of dielectric constant 4. It is charged at 100 volt. The electric field in volt/metre between the plates of the capacitor is
|
(a) 100 |
(b) 100000 |
(c) 25000 |
(d) 4000000 |
Two capacitors of capacitances 3 μF and 6 μF are charged to a potential of 12 V each. They are now connected to each other, with the positive plate of each joined to the negative plate of the other. The potential difference across each will be
|
(a) 6 volt |
(b) 4 volt |
(c) 3 volt |
(d) Zero |
An under water swimmer is at a depth of 12 m below the surface of water. A bird is at a height of 18 m from the surface of water, directly above his eyes. For the swimmer the bird appears to be at a distance from the surface of water equal to (Refractive Index of water is 4/3)
|
(a) 24 m |
(b) 12 m |
(c) 18 m |
(d) 9 m |
The magnetic moment of a circular coil carrying current is
|
(a) Directly proportional to the length of the wire in the coil |
|
(b) Inversely proportional to the length of the wire in the coil |
|
(c) Directly proportional to the square of the length of the wire in the coil |
|
(d) Inversely proportional to the square of the length of the wire in the coil |
A convex lens of power + 6D is placed in contact with a concave lens of power – 4D. What is the nature and focal length of the combination
|
(a) Concave, 25 cm |
(b) Convex, 50 cm |
(c) Concave, 20 cm |
(d) Convex, 100 cm |