An electric dipole has charges of ± 4.75 pC that are separated by 6.30 cm . The

Question

An electric dipole has charges of ± 4.75 pC that are separated by 6.30 cm . The dipole lies on thex-axis, its positive end lies on the +x-axis, and its center is at the origin. Located at y = +4.20 cm is a point charge carrying a charge of -2.35 pC

Part A

Determine the net force on the dipole. Answer in N

Part B

Determine the initial center of mass acceleration of the dipole (including direction) if it has a total mass of 8.65 ng Answer in m/s^2

Part C

Determine the torque on the dipole about its center of mass. Answer in m*N

Part D

Determine the direction of the torque on the dipole about its center of mass.

Clockwise or counterclockwise?

Explanation / Answer

A)
dipole moment, p = q*d

= 4.75*10^-12*0.063

= 2.99*10^-13 C.m

electric filed at equatorial point, E = k*p/(r^2 + (d/2)^2)^(3/2)

= 9*10^9*2.99*10^-13/(0.042^2 + 0.0315^2)^1.5

= 18.6 N/c

so, F = q*E

= 2.35*10^-12*18.6

= 4.37*10^-11 N <<<<<<------Answer

B) a = F/m

= 4.37*10^-11/(8.65*10^-12)

= 5.05 m/s^2 <<<<<<------Answer

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