Question

4. An electron and a proton are moving under the
influence of mutual forces. In calculating the change
in the kinetic energy of the system during motion,
one ignores the magnetic force of one on another.
This is because,
(a) the two magnetic forces are equal and opposite, so they
produce no net effect
(b) the magnetic forces do no work on each particle
(c) the magnetic forces do equal and opposite (but
non-zero) work on each particle
(d) the magnetic forces are necessarily negligible​

Answer 1

(b)the magnetic forces do no work on each particle

Answer 2

Answer:

Law of gravitation state that the force of attraction between any two masses is directly proportional and the distance between them is inversely proportion to the square of distance.