Question # 1

A long wire wound tightly on a cylindrical core is called:

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Potentiometer

Solenoid

Toroid

Wheat and stone bridge

None of these

magnetic field is a:

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Vector quantity

Scalar quantity

Scalar as well as scalar quantity

Any of (A) or (B)

Neither (A) nor (B)

The unit of flux density is also given by

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Weber/m²or Wb . m^-2

Weber/mor Wb . m

Weber/mor Wb . m^-1

Weber or Wb

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

Centripetal force for electron is given by

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mv²/ r

mv / r²

mv²/ r

mr²/ v

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 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

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)

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

CRO deflects the beam of

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proton

a-particle

electron

neutron

Electron gun consist of

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three anodes

heating cathode

three anodes

three anodes , heating cathode, grid

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

Amperean path is a:

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Closed path

Rectangular path

Circular path

Any of above

Broken path

The current sensitivity of the galvanometer is

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C/BAN

BAN/C

CAN/B

CBN/A

Ammeter is used to measure

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voltage

resistance

voltage and current

current

The sources of magnetic field are

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isolated magnetic poles

charges at rest

charges in motion

none of these

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