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1. Electric Charges and Fields
easy
A given charge is situated at a certain distance from an electric dipole in the end-on position experiences a force $F$. If the distance of the charge is doubled, the force acting on the charge will be
A$2F$
B$F / 2$
C$F / 4$
D$F / 8$
Solution
(d) Force on charge $F = q\,({E_a}) = q \times \frac{{k.2p}}{{{r^3}}}$ $==>$ $F \propto \frac{1}{{{r^3}}}$
When $r$ $\to$ doubled; $F$ $\to$ $\frac{1}{8}$ $times$
When $r$ $\to$ doubled; $F$ $\to$ $\frac{1}{8}$ $times$
Standard 12
Physics
