Electricity and Magnetism Answers

What is difference in direction of magnetic field around a current carrying coil while observing from below or above the conductor

a charge of 5c and 3kg mass is in vertical equilibrium due to electric field E find the electric field E.

if three identical charge are kept on vertex of equilateral triangle then find the electric field at its centoid.

a package is drop from the drone which is raising with velocity 0.5m/sec.find the distance between package and drone after 2.5sec?

A parallel beam of light of wavelength lembda is incident normally on a thin polymer film
with air on both sides. If the film has a refractive index n >1, then second-order bright
fringes can be observed in reflection when the thickness of the film is

Explain the lorentz force.

A piece of iron was found along the street of london by a school boy. At what angle should the iron be hammered into the ground inoder to make it a magnet?

Q.1 Consider three charge distributions
A. ρ (x, y, z) = kx

B. ρ (x, y, z) = k √ (x2 + y2)

C. ρ (x, y, z) = k √ (x2 + y2 + z2)

Consider a hydrogen atom undergoing a 2P 1S transition. The lifetime tsp of the 2P
state for spontaneous emission is 1.6 ns and the energy difference between the levels is
10.2 eV. Assuming that the refractive index of the medium n0 = 1, the ratio of Einstein
coefficients for stimulated and spontaneous emission   B 21/ A21 is given by

A policeman directing traffic is standing upright with his arms down at his side. He motions traffic by raising his arms to horizontal and pointing to the left with both arms perfectly straight at shoulder height. His overall center of gravity has been:

1. Raised and shifted right

2. Lowered and shifted right

3. Raised and shifted left

4. Lowered and shifted left