Electromagnetism Physics Problems: Get Expert Help with Plainmath

A rectangular coil of wire, 22cm by 35 cm and carrying a current of 1.4A, is oriented with the plane of its loop perpendicular to a uniform 1.5T magnetic field. 
a) calculate the net force and torque which the magnetic field exerts on the coil. 
b)the coil is rotated through a 30 degree angle about the y axis, the left side coming out of the plane. Calculate the net force and torque which the magnetic field now exerts on the coil

Two spherical objects are separated by a distance of ­${\displaystyle 1.80\times {10}^{­-3}}$ m. The objects are initially electrically neutral and are very small compared to the distance between them. Each object acquires the same negative charge due to the addition of electrons. As a result, each object experiences an electrostatic force that has a magnitude of ${\displaystyle 4.55\times {10}^{-21}}$ N. How many electron did? It take to produce the chargeon one of the objects?

A proton is released in a uniform electric field, and it experiences an electric force of ${\displaystyle 3.75\times {10}^{-14}N}$ toward the south. What are the magnitude and direction of the electricfield? The equation is E=f/q, but there is only one number and three variables. What numbers go in the other two?

A conducting sphere of radius 0.01m has a charge of ${\displaystyle 1.0\times {10}^{-9}C}$ deposited on it. The magnitude of the electric field in N/C justoutside the surface of the sphere is: 
a. 0 
b. 450 
c. 900 
d. 4500 
e. 90000