- ABiot-Savart law.
- BCoulomb’s law
- CFaraday’s law.
- DKirchhoff’s law.
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Magnetic flux ∅ (in weber) linked with a closed circuit of resistance 10 ohm varies with time t (in seconds) as ∅ =
The induced electromotive force in the circuit at t = 0.2 sec. is
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(a) 0.4 volts |
(b) – 0.4 volts |
(c) – 2.0 volts |
(d) 2.0 volts |
Refractive index for a material for infrared light is
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(a) Equal to that of ultraviolet light |
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(b) Less than for ultraviolet light |
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(c) Equal to that for red colour of light |
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(d) Greater than that for ultraviolet light |
For goldplating on a copper chain, the substance required in the form of solution is
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(a) Copper sulphate |
(b) Copper chloride |
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(c) Potassium cyanide |
(d) Potassium aurocyanide |
Missing lines in a continuous spectrum reveal
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(a) Defects of the observing instrument |
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(b) Absence of some elements in the light source |
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(c) Presence in the light source of hot vapours of some elements |
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(d) Presence of cool vapours of some elements around the light source |
In a PN-junction diode not connected to any circuit
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(a) The potential is the same everywhere |
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(b) The P-type is a higher potential than the N-type side |
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(c) There is an electric field at the junction directed from the N- type side to the P- type side |
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(d) There is an electric field at the junction directed from the P-type side to the N-type side |