Electricity and Magnetism Answers

If a virtual image is formed along the principal axis 10 cm from a concave mirror with focal length 15 cm what is the object distance from the mirror

The orbital speed of electron orbiting around the nucleus in a circular orbit of radius 50Pm is 2.2x 106 m/s, the magnetic dipole moment of an electron is

An alpha particle, of charge +3.2 × 10−19 C and velocity of magnitude 500 m/s, travels horizontally into a region of space in which there is an upward-directed uniform electric field of magnitude 20 N/C and a uniform magnetic field. The magnetic field makes an angle of 40° with the particle’s velocity vector, and is such that it causes the alpha particle to pass through the region of space undeflected.
Beginning with an explanation of what happens to the alpha particle in the presence of the electric field, explain clearly how the presence of the magnetic field causes the alpha particle to pass through undeflected.
Determine the magnitude of the magnetic field that is required to cause the alpha particle To pass through undeflected

Is there other ways to see the magnetic field lines around the bar magnet ?

A plane e.m. wave is travelling in an lossless dielectric medium having μ = 2, ε = 3
and has peak value electric field intensity of 6 V/m . The velocity of wave is

In a dielectric material having ε = 12 the displacement current is 25 times greater than
the conduction current at 100 MHz . The conductivity of the dielectric is

A medium has conductivity σ = 10 2 mho/m , μ=2, ε=3. The depth of penetration at 2 MHz is?

The ratio of electric field vectors E and magnetic field vector H has the dimensions of
(a) resistance
(b) inductance
(c) capacitance
(d) product of inductance and capacitance

In a radio wave if E=10^-4 V/m, Then find the magnitude of poynting vector?