Question # 1

The direction of lines of force depends upon the direction of

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voltage

current

charges

none of these

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

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N

N/Am

Am/N

Nm/A

None of these

When the charged particle is projected at right angles to the field, then experienced by it will be:

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Maximum

Zero

qvB

Both (A) and (B)

Both (A) and (C)

At a given instant, a photon moves in +x direction in a region where there magnetic field in -z direction. The magnetic force on the proton will be the:

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-y direction

+y direction

+z direction

-z direction

None of these

Amperean path is a:

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Closed path

Rectangular path

Circular path

Any of above

Broken path

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

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)

A meter wire carraying a current of 2A is at right angle to the uniform magnetic field of 0.5 Weber/m²The force on the wire is

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5N

4N

1.5N

6N

Which is modified form of galvanometer

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potentiometer

battery

voltmeter

slide wire bridge

Flurescent screen is a screen where visible spot

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vanishes

is made

becomes small and large

none of these

How many number of anodes used in electron gun

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one

two

three

six

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

A beam of electrons is provided by an

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electron gun

Suppray

Injection

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 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

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)

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Physics ECAT Pre Engineering Chapter 14 Electromagnetism Online Test MCQs With Answers

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