**Unformatted text preview: **unstable orientation. (d) The electric field of the dipole is directed from the positive charge and toward the negative charge. Thus, in Fig-ure 17.45a the electric field of the dipole is to the left, opposite to the direction of the external field. Reflect: For any orientation of the dipole the net force on the dipole is zero. But only for and is the net torque zero. u 5 180° u 5 0° u 5 180° 180°. u u 5 180° 180° u u 5 0° u u (a) F 1 F 1 F 2 F 2 (b) (c) (d) 2 q 1 q 1 q F 1 F 2 F 1 F 2 1 q 1 q 2 q 2 q 2 q E E E E u 5 180°, u 5 0° F 2 , F 1 F 2 5 qE , 2 q F 1 5 qE , 1 q F S 5 q E S . E S 2 2.00 m C E 5 1.04 3 10 7 N / C, E x 5 E 1 x 1 E 2 x 1 E 3 x 5 E 2 1 2 E 1 cos 53.1° 5 1.04 3 10 7 N / C E y 5 E 1 y 1 E 2 y 1 E 3 y 5 E 2 5 1 8.99 3 10 9 N # m 2 / C 2 2 2.00 3 10 2 6 C 1 0.0600 m 2 2 5 4.99 3 10 6 N / C E 1 5 E 3 5 1 8.99 3 10 9 N # m 2 / C 2 2 5.00 3 10 2 6 C 1 0.100 m 2 2 5 4.49 3 10 6 N / C Electric Charge and Electric Field 17-15...

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