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4B_SP10_con09_29

4B_SP10_con09_29 - Physics 4B Spring 2010 Conference 9...

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Physics 4B Spring 2010 Answers: 1. (a) 8.4 G circledot , (b) 4 2.2 10 N/C × , 2. (a) 5.9 A , (b) 0.37 N, 3. (a) ( ) ˆ ˆ ˆ ˆ 0.6 k, 0.6 j, 0.6 k, 0, 0.6 j N - - , (b) ( ) 2 ˆ ˆ 0.48 i 0.24k A m + , (c) ˆ 0.06 j N m Conference # 9 – Magnetic Forces 1. An electron is accelerated to the right by a potential difference of 2000 V. It then passes through a region where there is a uniform magnetic field. If the electron moves in a counter clockwise circle of radius 18 cm, (a) what is the magnitude and direction of the magnetic field? (b) Suppose you wish to make the electron pass through this region undeflected by applying an external electric field. What must the magnitude and direction of the electric field be? 2. (modified from Ch. 29, Exercise 16) A rod of length L = 15 cm and mass m = 30 g lies on a frictionless plane inclined at 37° to the horizontal, as shown in Fig. 29.43. A current enters and leaves the rod via light flexible wires, which we ignore. (a) For what current (magnitude and direction) will the rod be in equilibrium in a magnetic field
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