One Tesla is equal to
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(b) |
(c) |
(d) |
One Tesla is equal to
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There is a solid sphere of radius ‘R’ having uniformly distributed charge. What is the relation between electric field ‘E’ (inside the sphere) and radius of sphere ‘R’ is
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(a) E ∝ |
(b) E ∝ |
(c) E ∝ |
(d) E ∝ |
In the given current distribution what is the value of I
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(a) 3A |
(b) 8 A |
(c) 2A |
(d) 5A |
Two point charges of 20μC and 80 μC are 10 cm apart. Where will the electric field strength be zero on the line joining the charges from 20 μC charge
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(a) 0.1 m |
(b) 0.04 m |
(c) 0.033 m |
(d) 0.33 m |
A concave lens of glass, refractive index 1.5, has both surfaces of same radius of curvature R. On immersion in a medium of refractive index 1.75, it will behave as a
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(a) Convergent lens of focal length 3.5 R |
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(b) Convergent lens of focal length 3.0 R |
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(c) Divergent lens of focal length 3.5 R |
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(d) Divergent lens of focal length 3.0 R |
An electric motor operates on a 50 volt supply and a current of 12A. If the efficiency of the motor is 30%, what is the resistance of the winding of the motor
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(a) 6 Ω |
(b) 4 Ω |
(c) 2.9 Ω |
(d) 3.1 Ω |
An AIR station is broadcasting the waves of wavelength 300 metres. If the radiating power of the transmitter is 10 kW, then the number of photons radiated per second is
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(a) 1.5 |
(b) 1.5 |
(c) 1.5 |
(d) 1.5 |
The spectrum of iodine gas under white light will be
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(a) Only violet |
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(b) Bright lines |
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(c) Only red lines |
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(d) Some black bands in continuous spectrum |