Question

Two balls A and B of same mass (M) and charges Q,-Qare suspended by two strings of same length from two different suspension points S1 and S2. If S1S2 = 3x and AB = x then show that :
a) tension in string is T = Q²L/4πε₀x³
b) tanθ = Q²/4πε₀x²Mg​

Answer 1

Answer:

FromthefigurewehaveTcosθ=MgTsinθ=

4πε

0

x

2

Q

2

And2Lsinθ=2x⇒x=Lsinθ

Puttingthevalueofsinθweget

T=

4πε

0

x

3

Q

2

L

ThereforeoptionA

tanθ=

4πε

0

x

2

Mg

Q