4B_SP10_con10_30 - l carries a current I . Show that the...

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Physics 4B Spring 2010 Answers: 1. (a) ( ) ( ) 0 1 2 0 1 2 0 1 2 left right bottom top bottom ˆ ˆ ˆ i, i , ln j, = 2 2 2 I I c I I c I I b a F F F F F a a b a μ π + = = - = - + a a a a a Conference # 10 – Magnetic Fields, Biot-Savart 1. (modified from Ch. 30, Exercise 1) A long, straight wire and a rectangular loop lie in the same plane, as shown in Fig. 30.23. The dimensions and currents are indicated. (a) Find the force on each side of the loop. (b) Show that the net force on the loop is ( ) 0 1 2 2 I I bc F a a b = + 2. (Ch. 30 Exercise13 ) A square coil of side
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Unformatted text preview: l carries a current I . Show that the field strength at its center is 3. (Ch. 30, Example 30.3) A circular loop of radius a carries a current I . Show that the magnetic field along the axis of the loop at a distance z from the center is ( ) 2 3/2 2 2 2 Ia B a z = + Useful equations: ( ) 2 1 2 4 finite, straight wire: sin sin 4 long, straight wire: 2 F IL B I d r dB r I B r I B r = = =-= h h h h h l...
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