Question # 1

The unit of magnetic flux is

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Weber-m²

Weber-m³

Henry

Weber

Hold the solenoid in the right hand with fingers curling in the direction of current. The direction of the field will be given by:

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Thumb

Curled fingers

Middle finger

Arm of right hand

None of these

Magnetic flux passing through the an element of are A placed perpendicular to a uniform magnetic field Bis:

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Maximum

Minimum

Zero

Very small

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

Electron gun consist of

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three anodes

heating cathode

three anodes

three anodes , heating cathode, grid

The straight current carrying conductor experiences maximum force in a uniform magnetic field when it is placed

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parallel to the field

Perpendicular to the field

At an angle of 45 to the field

None of the above

Strength of magnetic field is measured in SI units, in:

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N

N/Am

Am/N

Nm/A

None 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

Amperean path is a:

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Closed path

Rectangular path

Circular path

Any of above

Broken path

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)

Ammeter is used to measure

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voltage

resistance

voltage and current

current

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

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

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

When the waveform of one voltage is increasing and that of second is decreasing and vice versa, then phase difference between these voltage is

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90°

75°

0°

180°

The vector representation of force experience give the direction of

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magnetic field

current

length of conductor

force

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

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weak

strong and uniform

none-uniform

zero

The field around a moving charge is called

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magnetic field

conservative field

non-conservative field

none of these

The SI unit of magnetic induction is tesla which is equal to

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Newton/ampere-meter or N/A-m

Newton/ampere²-meter or N/A²-m

Newton/ampere²-meter² or N/A²-m²

Newton/ampere²-meter²or N/A²-m²

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

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minimum force

maximum force

zero

moderate force

The most suitable material for permanent magnet is

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cobalt

iron

steel

alaminium

The force acting as one meter length of the conductor placed at right angle to the magnetic field, when one A current is passing through it, defines the

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magnetic flux

magnetic induction

magnetic field

self inductance

F = I(L x B) is a

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vector

scalar

unit vector

none of these

In order to make a voltmeter, high resistance is connected with galvanometer, in

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perpendicular

may be paralled or pendicular

series

none of these

The magnetic field outside the solenoid due to current is

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strong

zero

weak

uniform

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

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 long wire wound tightly on a cylindrical core is called:

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Potentiometer

Solenoid

Toroid

Wheat and stone bridge

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 voltage increases linearly with

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time

velocity

acceleration

torque

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