Electricity and Magnetism Answers

Two particles are fixed to an x axis: particle 1 of charge -7.40 × 10-7 C is at the origin and particle 2 of charge +7.40 × 10-7 C is at x2 = 19.1 cm. Midway between the particles, what is the magnitude of the net electric field?

In the figure the electric field lines on the left have twice the separation as those on the right. (a) If the magnitude of the field at A is 47 N/C, what is the magnitude of the force on a proton at A? (b) What is the magnitude of the field at B?

In the figure particle 1 of charge q1 = 0.92 μC and particle 2 of charge q2 = -2.99 μC, are held at separation L = 10.9 cm on an x axis. If particle 3 of unknown charge q3 is to be located such that the net electrostatic force on it from particles 1 and 2 is zero, what must be the (a)x and (b)y coordinates of particle 3?

A magnetic field has the form

A magnetic field in a region of space produced by a long straight wire
carrying a current I has the form

A spherical shell (a spherical shell is the space between two concentric spheres of different radii) with inner radius a and outer radius b is filled with a dielectric material.

The polarization of the dielectric is given as
P ⃗=k/r r ̂
where k is a constant and r is the distance from the centre of the spherical shell
Find the electric field in the regions:
r<a
a<r<b
r>b

What are electromagnets and how their strength is affected?

How do voltage and resistance, affect the strength of electromagnets?

A particle carrying +2.35 \({\rm \; nC}\) of positive charge is at the origin of an xy coordinate system. Take \(V(\infty )\) to be zero for these calculations.
Calculate the potential \(V\) on the \(x\) axis at \(x\) = 3.0000 \(\rm m\).

A radio station broadcast at a frequency of 600KHZ. If the speed of light in air is 3 × 108ms−1−1. Calculate the wavelength of the radio wave