- AHuygens
- BNewton
- CYoung
- DMaxwell
Explanation:
In 1678, Dutch physcist, christian Huygens beived that light was made up of waves vibrating up and down perpendicular to the direction of the light travels, and therefore formulated a way of visualising wave propagation. This became known as Huygens Principe.
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In a coil of area
and 10 turns with a magnetic field directed perpendicular to the plane and is changing at the rate of
gauss/second. The resistance of the coil is 20 ohm. The current in the coil will be
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(a) 5 amp |
(b) 0.5 amp |
(c) 0.05 amp |
(d) 5 |
When a potential difference is applied across the ends of a linear metallic conductor
|
(a) The free electrons are accelerated continuously from the lower potential end to the higher potential end of the conductor |
|
(b) The free electrons are accelerated continuously from the higher potential end to the lower potential end of the conductor |
|
(c) The free electrons acquire a constant drift velocity from the lower potential end to the higher potential end of the conductor |
|
(d) The free electrons are set in motion from their position of rest |
An electron moving with a speed u along the positive x-axis at y = 0 enters a region of uniform magnetic field which exists to the right of y-axis. The electron exits from the region after some time with the speed v at co-ordinate y, then
|
(a) v > u, y < 0 |
(b) v = u, y > 0 |
(c) v > u, y > 0 |
(d) v = u, y < 0 |
Two different loops are concentric and lie in the same plane. The current in the outer loop is clockwise and increasing with time. The induced current in the inner loop then, is
|
(a) Clockwise |
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(b) Zero |
|
(c) Counter clockwise |
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(d) In a direction that depends on the ratio of the loop radii |
When light is incident on a doubly refracting crystal, two refracted rays-ordinary ray (O-ray) and extra ordinary ray (E-ray) are produced. Then
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(a) Both O-ray and E-ray are polarised perpendicular to the plane of incidence |
|
(b) Both O-ray and E-ray are polarised in the plane of incidence |
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(c) E-ray is polarised perpendicular to the plane of incidence and O-ray in the plane of incidence |
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(d) E-ray is polarised in the plane of incidence and O-ray perpendicular to the plane of incidence |