Question # 1

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 magnetic field outside the solenoid due to current is

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strong

zero

weak

uniform

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

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avometer

millimeter

voltmeter

none of these

A galvanometer is an instrument used to

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measure voltage across a circuit

detect current in a circuit

measure current flowing through a circuit

none of these

Gauss(G) is smaller unit of magnetic induction which is related to tesla(T) as

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IT = 10^-4G

IT = 10⁵G

IT = 10³G

IT = 10⁴G

A resistance used in galvanometer to make it voltmeter is called

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shunt resistance

high resistance

zero resistance

none of these

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°

Flurescent screen is a screen where visible spot

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vanishes

is made

becomes small and large

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 force exerted on an electron moving with velocity 'v' at right angle to the magnetic field is given by

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F=eVB

F=e²V/B

F=e/VB

F=B²/ev

The direction of lines of force depends upon the direction of

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voltage

current

charges

none of these

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

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

F = I(L x B) is a

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vector

scalar

unit vector

none of these

Centripetal force for electron is given by

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mv²/ r

mv / r²

mv²/ r

mr²/ v

Ammeter is used to measure

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voltage

resistance

voltage and current

current

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