Two electrons move parallel to each other with equal speeds v. The ratio of magnetic and electrical forces between them is ______ .

Options

A. `(v)/( c)`
B. `(c )/(v)`
C. `(v^(2))/(c^(2))`
D. `(c^(2))/(v^(2))`

Answer

C

Explanation

`F_(e)=(1)/(4piepsilon_(0)).(e^(2))/(r^(2))" ""and"" " F_(m)=(mu_(0))/(4pi).((e^(2)v^(2))/(r^(2)))`
`F_(m)/(F_(e))=mu_(0)epsilon_(0)v^(2)=(v^(2))/(c^(2))`
Since `" "mu_(0)epsilon_(0)=(1)/(c^(2))`