Question # 1

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

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

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

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minimum force

maximum force

zero

moderate force

Method "lamp and scale arrangement" used to measure the

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angle of deflection

restoring torque

magnetic field strength

current

A beam of electrons is provided by an

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electron gun

Suppray

Injection

None of these

Electron gun consist of

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three anodes

heating cathode

three anodes

three anodes , heating cathode, grid

Lorentz force is defined as

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q(E + V x B)

q(E x B + V)

q(E x V + B)

q(E x B)

In the region surrounding a current carrying wire:

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A magnetic field is setup

The lines of force are elliptical

Direction of lines of forces depends upon direction of current

Both (A) and (C)

All of these

The current in microamperes required to produce one millimeter deflection on a scale placed one meter away from the mirror of the galvanometer, defined the sensitivity of

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ammeter

voltmeter

galvanometer

avo-meter

Galvanometer is a device used for the detection of

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voltage

current

temperature

pressure

Avo-meter is used of measure the

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current, voltage

voltage, resistance

resistance, current

current, voltage and 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

The SI unit of magnetic induction is

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Gauses

Tesla

Weber

Weber²

The sources of magnetic field are

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isolated magnetic poles

charges at rest

charges in motion

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 current carrying conductor sets up its own:

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Electric field

Nuclear field

Magnetic field

Both (A) and (C)

All of these

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ECAT Physics Chapter 14 Electromagnetism Online Test MCQs With Answers

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