- AOnly electric field
- BOnly magnetic field
- ✓Both electric and magnetic field
- DElectromagnetic waves along with electric and magnetic field
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A solenoid is 1.5 m long and its inner diameter is 4.0 cm. It has three layers of windings of 1000 turns each and carries a current of 2.0 amperes. The magnetic flux for a cross-section of the solenoid is nearly
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(a) 2.5 × 10–7 weber |
(b) 6.31 × 10–6 weber |
(c) 5.2 × 10–5 weber |
(d) 4.1 × 10–5 weber |
In a triode valve
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(a) If the grid voltage is zero then plate current will be zero |
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(b) If the temperature of filament is doubled, then the thermionic current will also be doubled |
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(c) If the temperature of filament is doubled, then the thermionic current will nearly be four times |
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(d) At a definite grid voltage the plate current varies with plate voltage according to Ohm’s law |
The minimum deviation produced by a hollow prism filled with a certain liquid is found to be 30°. The light ray is also found to be refracted at angle of 30°. The refractive index of the liquid is
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(a) |
(b) |
(c) |
(d) |
Which of the following diagrams, shows correctly the dispersion of white light by a prism
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(a)
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(b)
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(c)
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(d)
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Assertion : Amongst alpha, beta and gamma rays, a-particle has maximum penetrating power.
Reason : The alpha particle is heavier than beta and gamma rays.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |