Question # 1

A galvanometer is an instrument used to

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measure voltage across a circuit

detect current in a circuit

measure current flowing through a circuit

none of these

Magnetic lines of force:

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Cannot intersect at all

Intersect at infinity

Intersect within magnet

Intersect at Neutral Point

None of these

A field is uniform and much stronger:

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Inside a long solenoid

Outside a long solenoid

At the end of a long solenoid

At the central point of long solenoid

None of these

The working of all DC electric meters (galvanometers, ammetersand voltmeters) depends upon

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Heating effect of current

Chemical effect of current

Magnetic effect of current

Electromagnetic effect of current

A galvanometer in which the coil comes to rest quickly after the current passed through it, or the current stopped form flowing through it, is called

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dead beat galvanometer

stable galvanometer

shunt galvanometer

sensitive galvanomter

The galvanometer can be made sensitive if the value of the factor C/BAN is

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constant

small

large

none of these

When charged particle is projected perpendicular to a uniform magnetic field its trajectory is

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circular

elliptical

cycloid

straight line

Charge to mass ratio (e/m) of an electron is given by the relation

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e/m = 2V/Br²

e/m = 2V/B²r

e/m = 2V/B²r²

e/m = V/2B²r²

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

A resistance used in voltmeter is called

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shunt resistance

high resistance

low resistance

zero resistance

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

For measuring large currents, an ordinary galvanometer cannot be used without proper, then both relates with each other as

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modification

voltage

current

resistance

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

A current carrying conductor sets up its own:

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Electric field

Nuclear field

Magnetic field

Both (A) and (C)

All of these

The force experienced by an electron projected in a magnetic field B with a velocity V is given by

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F=e(V x B)

F= -e(V x B)

F= e(B x V)

Both a and c

if the field is directed along the normal to the area, then flux is:

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Maximum

Equal to zero

Equal to BA

Minimum

Both (A) and (C)

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