Question

The electric charge, in uniform motion, produces-
A. Electric field only
B. Magnetic field only
C. Both a and b
D. Neither a or b

Answer 1

It is closely related to electric and magnetic fields. A shifting electric field leads to a shifting magnetic field and a shifting magnetic field leads to a shifting electric field. Electric charge is the physical property of matter that when placed in an electromagnetic field, causes it to experience a force.

Complete step by step answer:
An electric charge manufactures an electric field. This is essentially similar to the mass production of a gravitational field.
The electric field (E) produced by an electric point charge at a distance $r$ from it is given by
$\vec{E}=\dfrac{k q}{r^{2}} \hat{r}$
Where $q$ is the value of charge and $k$ is the universal electric constant with value.
$9 \times 10^{9} k g . m^{3} . s^{-4} . A^{-2}$
It gives rise to an electrical current when an electric charge is in uniform motion, because electrical current is nothing but the ratio
In the conductor, the charge flows to the time interval in which the charge flows.
Now, we know a magnetic field is produced by a current carrying conductor. Therefore, since a moving electric charge generates a current and a current generates a magnetic field in turn, a moving electric charge also produces a magnetic field in essence. An electric charge thus produces both an electric field and a magnetic field in uniform motion. Electricity and magnetism are actually very closely related. A shifting electric field leads to a shifting magnetic field and a shifting magnetic field leads to a shifting electric field.

So, the correct answer is “Option C”.

Note: Both electric and magnetic fields are produced only by moving electric charges. Only electric fields are produced by stationary electric charges, however. This idea should be profoundly understood.
The question should also be properly read by the student to determine if a stationary electric charge or one in uniform motion is described in the question. Otherwise a student can make a stupid mistake very easily.