Of the charge Q initially on a tiny sphere, a portion q is to be transferred to a second, nearby sphere. Both spheres can be treated a particles. For what value of q/Q will the electrostatic force between the two parts have 1/4 of the maximum possible value?(adsbygoogle = window.adsbygoogle || []).push({});

q1=Q when the charge is transferred its Q - q

q2=0 becomes q after transfer

F = K(|q1||Q-q|)/r^2

dF(q)/dq = 0

0 = dF/dq = K/r^2 d/dq (qQ - q^2)

then Q - 2q = 0

so q = Q/2

so Fmax is 1/2

My question is, where do i apply the 1/4 of the max. value? im rather confused. I thought it would just be 1/4 of the max.

any help would be appreciated. thanks.

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Charge Distribution.

**Physics Forums | Science Articles, Homework Help, Discussion**