Explanation:
Van de Graff generator is used to create a large amount of static electricity. A Van de Graff generator uses static electricity and a moving belt to charge a large metal sphere to a very high voltage. As the belt moves, electrons move from the rubber belt to the silicon roller, causing the belt to become positively charged and the roller to become negatively charged. As a result, it builds up positive charge.
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The example for non-ohmic resistance is
|
(a) Copper wire |
(b) Carbon resistance |
(c) Diode |
(d) Tungston wire |
A charge q is placed at the centre of a cube. Then the flux passing through one face of cube will be
|
(a) |
(b) |
(c) |
(d) |
A wire of length 100 cm is connected to a cell of emf 2 V and negligible internal resistance. The resistance of the wire is 3 W. The additional resistance required to produce a potential drop of 1 milli volt per cm is
|
(a) 60 W |
(b) 47 W |
(c) 57 W |
(d) 35 W |
The distance between the plates of a parallel plate capacitor is d. A metal plate of thickness d/2 is placed between the plates. The capacitance would then be
|
(a) Unchanged |
(b) Halved |
(c) Zero |
(d) Doubled |
A wire of length 5 m and radius 1 mm has a resistance of 1 ohm. What length of the wire of the same material at the same temperature and of radius 2 mm will also have a resistance of 1 ohm
|
(a) 1.25 m |
(b) 2.5 m |
(c) 10 m |
(d) 20 m |
A biconvex lens forms a real image of an object placed perpendicular to its principal axis. Suppose the radii of curvature of the lens tend to infinity. Then the image would
|
(a) Disappear |
|
(b) Remain as real image still |
|
(c) Be virtual and of the same size as the object |
|
(d) Suffer from aberrations |
