Recent content by austin007

So is A = pi * r * r cos(10 deg + 20 deg * t) correct?

It is the product of magnetic field, B and perpendicular surface area to B, A. I know B which is 1 T, how do I get A especially the angle.

A circular loop (with a radius of 10 cm) rotattes in a constant magnetic fiels, which has a magnitude of 1 T. At an instant when the angle between the magnetic field and the normal axis (to the plane of the loop) is equal to 10 degrees and is increasing at a rate of 20 degrees/s, what is the...

It's 2 different points: one at 15 cm away from 30 A wire; the other at 25 cm away from 40 A wire. The point does not coincides. Do I still add to get resultant or get 2 answers for 2 diff. points?

2 long straight parallel wires separated by a distance of 20 cm carry currents of 30 A and 40 A in opposite directions. What is the magnitude of the resulting magnetic field at a point 15 cm frm the wire carrying the 30 A and 25 cm from the other wire? How do I go about solving this problem?

thanks I understood finally...

The electric field just outside the surface of a hollow conducting sphere of radius 20 cm is 500 N/C and is directed outward. An unknown charge Q is then located at the center of the sphere. It is noted that the electric field is still directed outward but its magnitude has decreased to 100 N/C...

The e-field just outside the surface of a hollow conducting sphere of radius 20 cm is 500 N/C and is directed outward. Q is located at the center of the sphere. It is noted that the e-fields is still directed out ward with a magnitude of 100 N/C. What is the magnitude and sign of the unknown...