Question # 1

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 unit of magnetic flux is

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Weber-m²

Weber-m³

Henry

Weber

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

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N

N/Am

Am/N

Nm/A

None of these

Flurescent screen is a screen where visible spot

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vanishes

is made

becomes small and large

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

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

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

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

the current is pass through the straight wire. The magnetic field established around it has its lines of force:

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Circular and endless

Oval in shape and endless

Straight

Parabolic

All are true

When an electron enters in a magnetic field right angle to its motion, the magnitude of its velocity will be

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changed

zero

unchanged

none of these

41 The force experience, when proton projected in a magnetic field with velocity 'v' is

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+e(v x B)

-C(V x B)

+e²(v x B)

-e(v²x B)

The force exerted on a conductor of length L, carrying current I when placed in a magnetic field B is given by

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F=IB/L

F= L x B/I

F = IL x B

F = IL . B

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

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

A voltmeter is used to measure the

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potential difference

current

temperature

resistance

The direction of lines of force depends upon the direction of

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voltage

current

charges

none of these

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ECAT Physics Chapter 14 Electromagnetism Online Test MCQs With Answers

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