Categories
Physics

A device used for the detection of current is called

  • ohmmeter
  • voltmeter
  • ammeter
  • Galvanometer
Categories
Physics

Which of the following particles moving in magnetic field would not be deflected

  • α-particles
  • β-particles
  • electron
  • Neutron
Categories
Physics

Two parallel wires carrying current in opposite direction ———– —- each other

  • repel
  • Neither attract nor
    repel
  • Cancel each other’s
    effect
  • Attract
Categories
Physics

The expression B.∆l = µoI is known as

  • Faraday’s law
  • Lenz’s law
  • Gauss’s law
  • Ampere’s law
Categories
Physics

The S.I unit of permeability of free space is

  • 1/Weber A m
  • Weber A m
  • Weber A /m
  • Weber /Am
Categories
Physics

The magnitude of permeability of free space is

  • 4π / 10-7
  • 1/4π x 10-7
  • 4π x 107
  • 4π x 10-7
Categories
Physics

The relation B= µoI/2πr is called

  • Faraday’s law
  • Lorentz force
  • Ohm’s law
  • Ampere’s law
Categories
Physics

The magnetic field produced by a current carrying conductor at a point is B=

  • Ir/ µo2π
  • 1/µoI2πr
  • µoI2πr
  • µoI/2πr
Categories
Physics

An electron enters a region where the electric field E is perpendicular to magnetic field B. It will suffer no deflection

  • B=eE/v
  • E=Bev/2
  • E=eVB
  • E=vB
Categories
Physics

The e/m of an electron moving with speed along a circular path in a magnetic field is

  • Br/V
  • V/Br 
  • B/Vr
  • Vr/B