Question # 1

The value of magnetic field strength for parament magnets is.

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Unity

Infinity

Zero

Two

A heat sensitive resistor is called.

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Thermistor

Varibale resistor

Fixed resistor

Zero resistor

The force on a point charge due to electromagnetic fields is called.

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Lorenz force

Gauss's force

Newton's force

Ampere's force

Which one of the following instruments has the maximum resistance.

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Ammeter

Voltmeter

Micro ammeter

Milli ammeter

Which of the following quantity is defined in terms of the rate of change of electric displacement field.

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Conventional current

Electronic current

Displacement current

Pulsating current

Inserting a di electric between the plates of a charged parallel plate capacitor.

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Decrease the capacitance

Leaves teh capacitance the same

Encourages breakdown between the plates

Reduces the electric intensity between the plates

Two charged spheres are separated by 2 mm Which of the following would produce the greatest attractive force.

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+1 q and + 4 q

-1 q and -4 q

+2 q and +2 q

+2 q and -2q

A device consisting two different conductors that produce a voltage proportional to the temperature difference between either end of the pair of conductors is a.

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Thermistor

Thermocouple

Strain gauge

Potentiometer

An uncharged di electric body experience a force when placed in an electric field if.

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A field in non zero at the body

The electric is a polar material

The dielectric is a non polar material

The field is non uniform over the body

On which factor the self induction does not depends upon.

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Number of turns of the coil

the core material

Weight of the coil

Area of the cross section of the coil

The unit of electrochemical potential is.

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J mol-1

volt

J C-1

Mol J-1

A steel of which material should be placed between the plates of a parallel plate capacitor in order to increase its capacitance.

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tin

Iron

Copper

Mica

When a conductor situated in a dielectric is charted the energy resides.

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Only on the dielectric

Only on medium surrounding charge

On the dielectric and medium both

Only on the type of the charge

In which of the following eddy current is not used

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Induction furnace

Automobile speedometer

Electromagnetic damping

X- rays diffraction

Which device converts alternating current to direct current.

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Motor

Generator

Transformer

Rectifier

Which statement is true about the Magnetic poles.

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Unlike poles repel

Like poles attract

Magnetic poles do not effect each other

A single magnetic pole does not exist

The direction of induced emf during electromagnetic induction can be determined by making use of.

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Faraday's law

Ampere;s law

Lenz's law

Laplace law

in the region where the field lines are parallel and equally spaced, the field is.

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Zero

Unirorm

Non uniform

Negative

The sum of positive and negative peak values are usually written as.

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rms value

p-p value

Peak value

Instantaneous value

An electric lamp use energy at the rate of 46 W on a 12 V supply. How much charge passes through the lamp in 2s.

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0.15 C

0.50 C

2.0 C

8.0 C

Which equation in electromagnetism describe the magnetic field B generated by an electric current.

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ampere's circuital law

Bio savart law

Gauss's law for electromagnetism

Coulomb's law

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