问题 16
1分
An electric dipole that has a positive charge of $4.8 \times 10^{-19}$ C is separated from a negative charge of the same magnitude by $6.4 \times 10^{-10}$ m. The electric potential at a point $9.2 \times 10^{-10}$ m from each of the two charges is
9.4 V
zero
4.2 V
$5.1 \times 10^9$ V
1.7 V