Question # 1

The SI unit of flux density is.

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NA-1 m2

NA-1 m-1

NAm-1

NA-1 m

In order to increase sensitivity of galvanometer the value of C may be

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Increase

Decrease

Neither increase nor decrease

Remain same

Magnetic flux density is measured in

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Weber

Weber/m2

Tesla -m

Gauss

If a charge is at rest in a magnetic field then force on charge is

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Zero

Double

One fourth

Four times

e/m=

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v/Br

Br/V

VB/r

Vr/B

If current flowing through a solenoid becomes four times, then magnetic field inside becomes.

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two times

three times

four times

Half

Which one has the least resistance.

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Galvanometer

Ammeter

Ohm meter

Volta meter

The sum of electric and magnetic force is called.

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Maxwell force

Lorentz force

Newton's force

Centripetal force

To convert a galvanometer into a volt meter a high resistance is connected.

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In series

In parallel

In perpendicular

Along tangent

Brightness of screen of CRO controlled by

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Grid

Filament

Anode

Cathode

Two parallel wires carrying currents in the opposite direction.

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Repel each other

Attract each other

Have no effect upon each other

They cancel out their individual magnetic fields.

A galvanometer is an electrical instrument used to

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Measure resistance

Measure voltage

Detect passage of current

None of these

NIBA =

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cθ

θ/c

c²θ

c²/θ

The magnetic field is uniform and stronger

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Outside the solenoid

Inside the solenoid

At the central part of the solenoid

None of these

___ is correct relation.

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IT = 10^-4G

IT = 10⁴ G

IT = 10² G

IT = 10^-2 G

The acceleration of an electron of mass m and charge e, moving with uniform speed v at right angles to a magnetic field of flux density B, is given by

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Bevm

The effective way to increase the sensitivity of moving coil galvanometer is.

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Increase the area of coil

Increase the number of turn

Increase the magnetic field

Increase the value of constant C

A soft iron cylinder is placed inside coil galvanometer to:

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Make field circular and strong

Make field radial and weak

Make field radial and strong

All of above

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