Question # 1

In the experiment of force on a current carrying conductor in a uniform magnetic field the magnitude of force depends upon which factor.

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Force is inversely proportional to current

Force is directly proportional to current

Force is inversely proportional to voltage

Force is directly proportional to voltage

The rms value of emf in a circuit is given by a factor of.

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0.637

0.7

0.707

1.11

The direction of force on a moving negative charge will be.

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Opposite to that of positive charge

Similar to that of positive charge

At right angel to the positive charge

Parallel to the positive charge

A straight wire carrying current will experience a force when placed in a uniform magnetic field if

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The current and field are parallel

The current and field are at an angle

the current and field are parallel in opposite directions

All of the above

Magnetic moment is a

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Scalar

Vector

Phasor

Tensor

A heat sensitive resistor is called.

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Thermistor

Varibale resistor

Fixed resistor

Zero resistor

What happens to a soap bubble, when some charge is given to it.

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It collapses

It increases in size

It decreases in size

It feels nothing

The effective resistance in an A.C. circuit is

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An inductance

An impedance

A mutual inductance

Always zero

Which physical law expresses the relationship between the heat generated and the current through a conductor.

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Ohm's law

Kirchoff's law

Joule's law

Ampere's law

The work done is moving a very small charge in an electric field from one point to another is

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Independent of the path

Equal to the potential difference between the two points.

Measured in V m-1

Measured in J c-1

The value of voltage or current that exists in a circuit at any instant of time measured from some reference point is its.

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Peak value

Peak to peak value

Instantaneous value

Average value

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

Select the one that is not a donar

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P

AS

Sb

In

Self inductances of solenoid is

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Directly proportional to the current flowing through the wire

Directly proportional to its length

Inversely proportional to area of corss section

Directly proportional to number of turns

A straight copper wire a moved in a uniform magnetic field such that it cuts the magnetic lines of force then.

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emf will not be induced

emf will beinduced

sometimes emf will be induced and sometimes not

The number of turns iin the coil increases

What is the value of earth's magnetics fields.

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5 G

50 G

100 G

500 G

The strength of the magnetic field around the current carrying conductor is

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Smaller near the conductor

Greater near the conductor

constant everywhere

Changing everwhere

The energy stored per unit volume inside the solenoid is called.

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Energy density

Mass density

Charge density

Volume density

The Lenz's law is also a statement of the law of conservation of.

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Energy

Mass

Momentum

Torque

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

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

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Absolute potential

Motional emf

Induced emf

Terminal potnetial

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