ch22-p081 - 81. (a) From Eq. 22-38 (and the facts that i i...

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81. (a) From Eq. 22-38 (and the facts that ±± ii=1 and ji=0 ), the potential energy is () ( ) 30 26 ˆˆ ˆ 3.00i 4.00j 1.24 10 C m 4000 N C i 1.49 10 J. Up E ⎡⎤ =− ⋅ =− + × ⎣⎦ =− × G G (b) From Eq. 22-34 (and the facts that ii0 × = and ±± ± ji =k ×− ), the torque is G G G τ =×= + × ⋅ × × pE 300 124 10 4000 198 10 30 26 . .
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