Electricity and Magnetism Answers

: Consider a sphere of radius 5 mm placed in free space containing a total amount of charge ‘Q’. The electric potential due to the distribution of the charge is V = 7 R2 Sin θ Cos ϕ. Find out the numeric value of the charge Q enclosed by the surface.

Consider a sphere of radius 5 mm placed in free space containing a total amount of charge ‘Q’. The electric potential due to the distribution of the charge is V = 7 R2 Sin θ Cos ϕ. Find out the numeric value of the charge Q enclosed by the surface.

a toroid is madeof 2 000 turns of wire of radius 2.00 cm formed into a donut shape of inner radius 10.0 cm and the outer radius 14.0 cm. when a 30.0 A current is present to the toroid,determine the magnetic field at a distance of 11.0 cm from the center of the toroid .

A wire carries a current of 10A in a direction 30º to a uniform magnetic field of

0.30 T. Find the force on 5.0 m of the wire.

A uniform magnetic field 0.50T is directed at an angle of 60° to the plane of a 100 turn, rectangular cooper coil of length 0.04m and width 0.05m. The diameter of the copper wires which makes up the coils is 1.00mm and the resistivity of copper is 1.7 * 10^-8 ohmmeter. The magnetic field through the loop decreases to zero in 0.3s. Determine

(I.) The initial flux through the coil.

(ii.) The average induced e.m.f in the coil as the field decreases

The electric field between the plates of charged parallel plate capacitor decreases from 12V/m to X V/m. If the number of atoms per unit volume is N x 1028 atoms m-3, the electronic polarisability of the material is

X = 6.00 N = 13.84

A circular current loop of radius 6 angstrom and a current of I pico Ampere is placed in a magnetic field of strength B T. find the potential energy of the magnetic dipole.

I = 69.20 B = 13.40

"An iron rod of length 0.5m has a cross sectional area of A x 10-4 m2. If the flux of magnetic induction through the bar is B x 10-4 Weber and relative permeability of iron is 1000, calculate, Magnetisation M and Intensity of magnetising field H

"

A = 1.96 B = 10.05

If two like charges, each having a charge of four micro coulombs sit .6meters apart. The force between them will be?

A vertical steel rod is 3 m long and has a radius of 0.1m. It is

supporting a load of 1 × 105 N. What is the stress in the rod?