Question # 1

The field around a moving charge is called

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magnetic field

conservative field

non-conservative field

none of these

Weber is a unit of

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magnetic flux

magnetic filed intensity

magnetic induction

magnetic flux density

A beam of electrons is provided by an

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electron gun

Suppray

Injection

None of these

If volume of wire is 'AL' and there are 'n' numbers of charge carriers per unit volume, then the total number of charge carriers are

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n/AL

Al/n

nAL

nA/L

In a straight current carrying conductor, the direction of magnetic field can be found by

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right hand rule

left hand rule

head to tall rule

none of these

Ammeter is used to measure

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voltage

resistance

voltage and current

current

The voltage increases linearly with

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time

velocity

acceleration

torque

Flurescent screen is a screen where visible spot

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vanishes

is made

becomes small and large

none of these

Magnetic flux passing through a element whose vector area makes an angle0º with lines of magnetic force is:

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BACosѲ

Zero

BA

BA sinѲ

None of these

To convert galvanometer into ammeter we connect

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small resistance in parallel with galvanometer

small resistance in series with galvanometer

high resistance in series with galvanometer

high resistance in parallel with galvanometer

The force acting on a charge moving in a magnetic field

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is perpendicular to the both magnetic field and direction of motion

is proportional to the magnetic of charges

vanishes when the motion is directly opposite to the direction of field

all of the above

The working of galvanometer depends upon torque exerted on a current carrying coil in

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magnetic field

electric field

gravitational field

nuclear field

Current is measured in

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volts

watt

ohm

ampere

A magnetic force on an electron travelling with 10⁸ms^-1parallel to a field of strength 1 Wb m^-2is

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Zero

10⁵m

10^-10N

10⁸N

A current carrying conductor is placed at right angle to the magnetic field. The magnetic force experienced by the conductor is

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minimum

maximum

zero

none of these

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