alleryAt an axial point of an electric dipole at distance r >> a (a = dipole half-length, p = qa·2 the dipole moment), E equals:
Akp/r²
B2kp/r³
Ckp/r³
D-2kp/r³
Answer & Solution
Correct answer: B. 2kp/r³
E_axial = 2kp/r³ along the dipole axis.
(Compare to equatorial: E = -kp/r³ — half the magnitude, opposite direction.)
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