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Homework Assignment #5 Physics E-1b spring 2013 Due by 6:00 pm on Thursday, March 14 Assignments should be dropped into your Section TF's locked...

Problems #3, 4, 5 and Multiple Choice #1, 2, 3, 4

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6. In an electric motor, a circular coil with 100 turns of radius 2.0 cm can rotate between the poles of a magnet. When the current through the coil is 75 mA, the maximum torque that the motor can deliver is 0.0020 N m. (a) What is the strength of the magnetic field? (b) Is the torque on the coil clockwise or counterclockwise as viewed from the front at the instant shown in the figure? 7. A long straight wire carries a current of 3.2 A in the positive x-direction. An electron, traveling at 6.8 × 10 6 m/s in the positive x-direction, is 4.6 cm from the wire. What force acts on the electron? 8. Two parallel wires in a horizontal plane carry currents I 1 and I 2 to the right. The wires each have length L and are separated by a distance d. (a) What are the magnitude and direction of the field due to wire 1 at the location of wire 2? (b) What are the magnitude and direction of the magnetic force on wire 2 due to this field? (c) What are the magnitude and direction of the field due to wire 2 at the location of wire 1? (d) What are the magnitude and direction of the magnetic force on wire 1 due to this field? (e) Do parallel currents in the same direction attract or repel? (f) What about parallel currents in opposite directions?
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Q3)
Length (l )=25 cm = 0.25m
Current (I) = 100 A
Magnetic Field (B) = 2 T
Force = B*I*L
F = 2 * 100* 0.25
F = 50 N
Q4)
Length (L )= 4 cm = 0.04m
Current (I) = 30 A
Force (F) = 2.16 N
Magnetic...

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