Question # 1

B2/2p is the expression of.

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Lenz's law

Magnetic energy

Magnetic energy density

Back emf

In A.C circuit through a capacitor which one is:

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Current leads voltage by 90^∘

Current lags behind voltage by 90^∘

Both will be in phase

None of above

Total flux through a closed surface depends on.

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Shape of surface

Medium only

Charge enclosed only

Charge and Medium

Energy stored in inductor is.

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1/2 L I²

1/2 LI

1/2 L2I

1/2 L2I2

Energy stored per uint volume inside a solenoid is called as

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energy density

Electric flux

Work

Volume charge density

The converses of annihilation of matter is:

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Photoelectric effect

Relativistic effect

Pair production

Compton effect

Application of wave like nature of particle is

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Photodiode

Optical microscope

Electron microscope

Compound microscope

The charge on Beta particle is

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+e

-e

-2e

None of these

Using relativistic effects the location of an air craft after an hour fight can be predicated about

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20 m

50 m

760 m

780 m

Transistor was invented by:

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Bardeen

Micheal faraday

Lenz

Newton

Compton effect proves.

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Wave nature of radiation

Wave nature of particle

Dual nature of particle

Particle nature of radiations

Charge on electron is

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1.6 x 10^-19 C

1.6 x 10¹⁹C

1.6 x 10^-17C

1.6 x 10¹⁷C

The emf induced by the motion of a conductor across a magnetic field is called:

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Motional emf

Rotational emf

Induced emf

All of above

If the potential difference across two plates of capacitor is doubled, then energy stored in it will be.

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Two times

Eight times

Four times

Remain same

The central region of a transistor is called.

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Emitter

Collector

Base

Neutral

The unit of magnetic induction is:

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Tesla

Weber

Weber metre

NAm^-1

The materialization of energy take place in the process of.

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Photo electric effect

Compton Effect

Pair production

Annihilationof matter

An electron moves at 2 x 10² m/sec perpendicular to magnetic field of 2T what is the magnitude of magnetic force:

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1 x 10^-6 N

6.4 x 10^-17 N

3.6 x 10^-24 N

4 x 10⁶ N

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