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(B) $1$. In a uniform electric field $E$, the force on the positive charge is $F_+ = qE$ and the force on the negative charge is $F_- = -qE$.$2$. The

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Zero and minimum

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(B) $1$. In a uniform electric field $E$, the force on the positive charge is $F_+ = qE$ and the force on the negative charge is $F_- = -qE$.$2$. The net force on the dipole is $F_{net} = F_+ + F_- = qE - qE = 0$.$3$. The potential energy $U$ of a dipole in an electric field is given by $U = -p \cdot E = -pE \cos 	heta$.$4$. When the dipole moment $p$ is aligned with the electric field $E$, the angle $	heta = 0^\circ$.$5$. Thus, $U = -pE \cos(0^\circ) = -pE$, which is the minimum possible potential energy.

An electric dipole has a charge of magnitude $q$ and a dipole moment $p$. It is placed in a uniform electric field $E$. If its dipole moment is aligned with the direction of the electric field, the force acting on it and its potential energy will be, respectively:

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