Electricity and Magnetism Answers

A cell has a terminal voltage of 50.0 V for a current of 10.0 A, and 54 V for a current of 6.0 A. Find the external resistance of each cell

A point charge has a charge of 9.00 x 10^-11C. At what distance from the point charge is the electrical potential (a) 13.0 V? (b) 25.0 V?

Two spheres of equal mass and equal charge are separated at a distance r.

(a) Derive an expression for the quantity of charge that must b on each sphere so that the spheres are in an equilibrium where attractive and repulsive forces are balanced.

(b)How would doubling the distance between spheres affect the expression for the value of q from the previous problem. Explain.

A point charge q₁ = +3.90 is at origin. How far should the second point charge of +6.30  be placed to have electric potential energy of 0.700 J?

A point charge q₁ = + 7.00 x 10^-10 C is at the point x = 0.900m, y= 0.700 m and a second point charge q₂ = -3.00 x 10^-10 C is at the point x = 0.900 m, y= 0m . Calculate the magnitude and direction of the resultant electric field at the origin due to these charges. 

3. How many excess electrons must be added to an isolated spherical conductor 0.100 meters in diameter to produce an electric field of 1800 N/C just outside the surface?

An aluminum disk is held between the poles of a powerful magnet and then pulled out. The person pulling on the disk feels an opposing force due to currents induced through Faraday's law. Explain why the magnitude of the force becomes larger as the disk is pulled faster.

. A battery that has q=10000 C

q=10000 C and ΔV=12 V

ΔV=12 V. Find the total electric potential energy.

What is the magnitude of the force on a charge of +2x10-7 C that is 0.3 m from a charge of -5x10-7 C?

Two charges lie on positive x-axis. Charge A (3.0 x 10^-9 C) is 3.0 cm from the origin and Charge B is 5.0 cm from the origin. (-4.0 x 10^-9 C). What is the total force exerted by these two charges on Charge C (6.0 x 10^-9 C) located at the origin?