Question # 1

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

Resistance is measured in

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volts

ampere

ohm

watt

NmA^-1is commonly called:

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Weber

Apmere

Guass

Coulomb

None of these

(CRO) Cathode ray oscilloscope is a device used for high speed

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velocity

graph plotting

time-velocity

none of these

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

The voltage increases linearly with

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time

velocity

acceleration

torque

Electron gun consist of

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three anodes

heating cathode

three anodes

three anodes , heating cathode, grid

The torque per unit twist of coil is called

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proportionality constant

gravitational constant

boltzman constant

coupling constant

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

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 SI unit of flux density is.

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Tesla

Weber

Gaun

Weber/meter

How many number of anodes used in electron gun

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one

two

three

six

Magnetic flux passing through a element whose vector area makes an angle0º with lines of magnetic force is:

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BACosѲ

Zero

BA

BA sinѲ

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

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)

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