Electrodynamics

Unit of magnetic moment is

• J-T

• J/T

• J/m

• J-m

The ratio of intensity of magnetic field at the centre of a very long solenoid to that at the extreme ends is

• 2

• ½

• 4

• ¼

Torque acting on a dipole is maximum by a magnetic field when,

• Θ=0

• Θ=90

• Θ=45

• Θ=30

The inductance of a coil depends on

• Number of turns of coil

• type of core

• spacing between the turns

• all of the above

Induced electric field is

• Conservative

• non conservative

• both

• none of these

For an ideal transformer

• Ep/Es =Np/Ns

• Ep/Es =Ns/Np

• both a) and b)

• none of these

The trajectory of the charged particle in an electric field within the parallel plates is

• Parabola

• hyperbola

• circle

• straight line

Calculate the radius of the path of an electron in a magnetic field of induction 10-4 Wb/m2 perpendicular to its path (velocity of electron is 1.9x 108m/s)

A magnetic field has no effect on

• Stationary magnets

• moving magnets

• stationary charges

• magnetic lines of force

Which of the following quantity is not a vector quantity?

• Magnetic moment

• magnetic intensity

• magnetic potential

• magnetic lines of force