Electricity and Magnetism Answers

Compute the electric potential from a source charge of -2.33 x

10^-13 C if a test charge will be placed 6.45 x 10^−15 m from it.

Compute the electric potential from a source charge of 4.31 x

10^3 C if a test charge will be placed 7.11 x 10^−12 m from it.

A positive and a negative charge, each of magnitude 2.6 x 10^–5 C, are separated by a distance of 25 cm. Find the force on each of the particles

What is the direction of the electric field resulting in two point charges equal to + q and -q, creating at point C of the field, which is equidistant from both charges.

what is the magnitude of the electric field at a point midway between a-6.5uC and +5.4uC charge 8.0cm apart ? assume no other charge nearby . express your answer using two significant figures.

If a friendly civilization of the Andromeda Galaxy contacts us that they will visit us.

(The signal will take about 2million years until it reaches us)

That moment the signal reaches us the departure of the fleet is in the past.

But what, if they visit us before the signal could reach us? 

Wouldnt that mean, that their departure is in the past for them and their arrival in the present?

And for us their arrival would be in the present but the departure in the future?

A metal sphere with radius 0.035 m has a charge 5 x10-6 C at its surface. Find the electric field E at the surface, the field at 0.02m out of the surface and the field at 0.02 m within the surface.

A proton is released from rest (Point A) in a uniform electric field that has a magnitude of 8.0 x 10(4) V/m. The proton undergoes a displacement of 0.50 m to Point B in the direction of E.  Find the change in electic potential between points A and B. 

For Nickel, the number density is 8à ƒ —1023 atoms/cm3 and the electronic configuration is 1s2 2s2 2p6 3s2 3p6 3d8 4s2. The value of saturation magnetisation of Nickel in its ferromagnetic states is : (use à Ž ¼B= 9.21à ƒ —10à ¢ ˆ ’21 Am2)

a. 3.87à ƒ —108A/m

b. 4.97à ƒ —108A/m

c. 4.87à ƒ —109A/m

d. 3.97à ƒ —109A/