Q. A charge of -3.30 nC amd a charge of -5.40 nC are separated by a distance of 60 cm. Find out the position at which a third charge of +7.10 nC can be located so that the net electrostatic force on it is zero.
Q. A space station, in the form of a wheel 100m in diameter, rotates to supply an "artificial gravity" of 3.7m/s2 for persons who walk around on inner wall of the outer rim. Find out the rate of rotation of the wheel (in revolutions per minute) that would produce this effect.