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how is a magnetic field generated?
a. charged particles that do not move
b. an isolated magnetic pole
c. moving electric charges
d. gravity

Magnetic field can be generated when electric charge is in motion.

In short, Your Answer would be Option C

Hope this helps!

Cwhen charge particle is in rest...electric field generates but when it is in motionit generates magnetic field !!! so C

When is this

W= fd
where f is an applied force and d is the distance over which it is applied. when a parachuting skydiver is at constant velocity, he is experiencing "terminal velocity", the point at which his acceleration down is canceled out by air resistance. that means that the resisting force of the air is equal to his weight, but in the opposite direction. with this, we can solve for the work done by the force.
w = fd
w = (92.0)(9.81 m/s^2) (325)
w= 2.93 x 10^5 j
the value for work in this case is positive because it is pushing up on the skydiver, who has a downward force of gravity.
therefore the answer is 2.93 x 10^5 j