Question # 1

The magnetic field outside the solenoid due to current is

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strong

zero

weak

uniform

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

When a suitable small resistance is put in parallel with the galvanometer coil, it is converted into

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Voltmeter

Avometer

Ammeter

None of these

When current passes through a solenoid coil, it behaves like a

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loop

circle

bar magnet

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

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

Centripetal force for electron is given by

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mv²/ r

mv / r²

mv²/ r

mr²/ v

The SI unit of magnetic induction is

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Gauses

Tesla

Weber

Weber²

Avo-meter is used of measure the

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current, voltage

voltage, resistance

resistance, current

current, voltage and resistance

Magnetic flux and flux density are related by

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Flux density = flux x area

Flux density = flux / area

Flux density = flux - area

None of these

Charge to mass ratio (e/m) of an electron is given by the relation

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e/m = 2V/Br²

e/m = 2V/B²r

e/m = 2V/B²r²

e/m = V/2B²r²

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

CRO deflects the beam of

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proton

a-particle

electron

neutron

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 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

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

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