- AElastomers
- BConductors
- CInsulators
- DPolymers
Explanation:
When an electric field is applied across the ends of conductors, the electrons begin to move under the action of the electric field. The flow of electrons constitutes electric current through the conductor.
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A convex lens of focal length 84 cm is in contact with a concave lens of focal length 12 cm. The power of combination (in diopters) is
|
(a) 25/24 |
(b) 25/18 |
(c) – 50/7 |
(d) + 50/7 |
If in a photoelectric experiment, the wavelength of incident radiation is reduced from 6000 Å to 4000 Å then
|
(a) Stopping potential will decrease |
|
(b) Stopping potential will increase |
|
(c) Kinetic energy of emitted electrons will decrease |
|
(d) The value of work function will decrease |
In an electrical cable there is a single wire of radius 9 mm of copper. Its resistance is 5Ω. The cable is replaced by 6 different insulated copper wires, the radius of each wire is 3mm. Now the total resistance of the cable will be
|
(a) 7.5 Ω |
(b) 45 Ω |
(c) 90 Ω |
(d) 270 Ω |