Question

Let E, G and N represent the magnitudes of electromagnetic, gravitational and nuclear forces between two electrons at a given separation. Then

• A. N > E > G
• B. E > N > G
• C. G > N > E
• D. E > G > N

Answer 1

The correct option is D E > G > N

Nuclear Forces are very weak forces and are short ranged. There effects are only in the nucleus otherwise they are negligible. In the given case electrons are kept at the separation, but there is no involvement of the nucleus.Thus, its magnitude will be very less.

For the Gravitational Force, it depends on the mass of the body. Thus, as the mass increases, the Gravitational Force also increases and vice versa. We know the mass of the electrons is $9.1\times {10}^{-31}kg$, which is very less, thus the gravitational force between the electrons at the given separation will also be less but its magnitude will be more than the Nuclear Force.

For the Electromagnetic Force, charged particles are necessary. Electrons are the charged particles whose charge is exactly equal to the charge on the protons, but mass of the electrons is much less. Hence, the magnitude of the Electromagnetic Force is larger than the other two.

Thus, the sequence of the magnitudes in descending order of the Forces is E > G > N.