the constant difference of length between a rod of aluminium ( coeficient of linear expansion is 24×10^_6) and a rod of brass (coeficient of linear expansion is 19×10^_6) is 8cm all temperatures equal. calculate the length of each rod

force required to detach it is given by

charges are taken to be fundamental charge

now we have

so above is the minimum distance at which it will detach

the strength of the electric field on the point charge= n/c

the electric field is given by

e=

q=6μc= 6 x 10⁻⁶c

r=100 m

e=

e=5.4 n/c

so the electric field on the point charge= 5.4n/c