Question # 1

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 solenoid is a coil of wire which is:

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Short, loosely wound, cylindrical

Long, tightly wound, spherical

Long, loosely wound, cylindrical

Long, tightly wound, cylindrical

None of these

NmA^-1is commonly called:

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Weber

Apmere

Guass

Coulomb

None of these

A shunt resistance parallel to the galvanometer is used to convert it into

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avometer

millimeter

voltmeter

none of these

In the expression of force experienced by electron, the direction of both v and B are

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parallel

zero

perpendicular

none of them

'K' is the proportionality constant of force experienced by conductor. What is the value of 'K' in SI units?

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0

1

0.5

-1

For the conversion of galvanometer into voltmeter, we connect a

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small resistance in series with galvanometer

small resistance in parallel with galvanometer

high resistance in parallel with galvanometer

high resistance series with galvanometer

The most suitable material for permanent magnet is

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cobalt

iron

steel

alaminium

The field around a moving charge is called

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magnetic field

conservative field

non-conservative field

none of these

Total number of turns on 0.15 m length solenoid is 300. the value of n is:

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Greater than 300

Smaller than 300

Equal to 300

Any of (A) or (B)

Any of (A) or(C)

The magnetic field inside a solenoid can be increased by:

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Increasing n

Decreasing I

Increasing I

By using iron core within solenoid

All correct except (B)

Galvanometer is a device used for the detection of

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voltage

current

temperature

pressure

A charged particle moving at right angle to the magnetic field will experience

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minimum force

maximum force

zero

moderate force

Magnetic induction is also called as:

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Ampere’s law

Faraday’s law

Lenz’s law

Newton’s law

Coulomb’s law

If the value of galvanometer constant k = C/BAN is made small, the galvanometer can be made

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Sensitive

Accurate

Stable

None of these

The e/m of an electron moving in a circular path in a magnetic field is equal to

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V/Br

V/B²r²

V²/Br²

V²/Br

The force experienced by a single charge carrier moving with velocity 'v' i magnetic field of strength 'B' is given by

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F =q(v/B)

F=q²(v x B)

F=q(v x B)

F= vx B

A resistance used in galvanometer to make it voltmeter is called

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shunt resistance

high resistance

zero resistance

none of these

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

The magnetic field in the middle of a solenoid due to current is

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weak

strong and uniform

none-uniform

zero

A beam of electrons is provided by an

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electron gun

Suppray

Injection

None of these

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)

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

The direction of lines of force depends upon the direction of

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voltage

current

charges

none of these

Weber is a unit of

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magnetic flux

magnetic filed intensity

magnetic induction

magnetic flux density

The SI unit of magnetic permeability is

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WB A^-1m^-1

WB mA^-1

WB Am^-1

None of these

In the formula B= µ̻ nl, the symbol n denotes:

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Total number of turns of solenoid

Number of turns per unit length

Number of turns per unit volume

Numbers of turns per unit area

Number of moles

If current through conductor is 1 A and length of conductor is 1m placed at right angle to the magnetic field, then the strength of magnetic field is

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F = B²

F = 0

F = B

F = B/2

A resistance used in voltmeter is called

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shunt resistance

high resistance

low resistance

zero resistance

The SI unit of magnetic flux is.

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weber

Nm^-1A^-1

tesla

gauss

The SI unit of magnetic flux is

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NmA^-2

NmA^-1

NAm^-1

Nm²A^-1

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