qz6sp09sol - PHY2054 Discussion-Spring 09 Quiz 6(Chapter...

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March 17, 2009 PHY2054 Discussion-Spring ‘09 Quiz 6 (Chapter 19.7-20.4) Name: UFID: **1. (2.5pts) A long straight wire carrying a current I 1 =20.0 A lies in the same plane of a rectangular loop carrying a current I 2 = 5.00 A as shown below. The dimensions shown are c = 0.100 m, a = 0.200 m and l = 0.500 m. What is the magnitude and direction of the net force exerted by the magnetic field due to the straight wire on the loop? Two straight currents in the same direction attract each other and those in opposite directions repel each other, thus the force on the left side of the loop is to the right and that on the right side of the loop is to the left. Taking the positive direction to the right, the net force on the loop is F = F l – F r = μ 0 I 1 I 2 l/(2πc)- μ 0 I 1 I 2 l/[2π(c+a)] = 4π×10 -7 ×20×5×0.5/(2π)×[1/0.1-1/0.3] = 6.67×10 -5 N to the right *2. (2.5pts) A rectangular box with dimensions 8 cm × 10 cm × 9 cm is immersed in a uniform magnetic field with components B x
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qz6sp09sol - PHY2054 Discussion-Spring 09 Quiz 6(Chapter...

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