An infinite line of positive charge lies along the y axis, with charge density ? = 2.80 ?C/m. A dipole is placed with its midpoint along the x axis at x = 30.00 cm. The dipole consists of two charges ±10.0 ?C separated by2.00 cm. The axis of the dipole makes an angle of 31.0° with the x axis, and the positive charge is farther from the line of charge than the negative charge.

(a) Find the magnitude of the force exerted on the negative charge of the dipole.

N

(b) Find the magnitude of the force exerted on the positive charge of the dipole.

N

(c) Find the magnitude of the net force exerted on the dipole.

N

(d) Find the magnitude of the net torque exerted on the dipole. Calculate the torque about the midpoint of the dipole.

N·m