Serway_CP_poll_ch19

# Serway_CP_poll_ch19 - Two long parallel wires 20 cm apart...

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and 8A in the same direction. Is there any point between the two wires where the magnetic field is zero? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. Yes, midway between the wires. 2. Yes, 12 cm from the 5A wire. 3. Yes, 7.7 cm from the 5A wire. 4. No.

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A rectangular coil (0.20 m x 0.80 m) has 200 turns and is in a uniform magnetic field of 0.30 T. If the orientation of the coil is varied through all possible positions, the maximum torque on the coil by magnetic forces is 0.080 N-m. What is the current in the coil? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 5.0 mA 2. 1.7 A 3. 8.3 mA 4. 1.0 A
A circular coil (radius = 0.40 m) has 160 turns and is in a uniform magnetic field. If the orientation of the coil is varied through all possible positions, the maximum torque on the coil by magnetic forces is 0.16 N-m when the current in the coil is 4.0 mA. What is the magnitude of the magnetic field? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 0.37 T 2. 1.6 T 3. 0.50 T 4. 1.2 T

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a current of 2000 A. What is the magnetic field due to the current directly underneath the powerline? (µ 0 = 4∏ x 10 -7 T-m/A) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 20.0 µ T 2. 35.0 µ T 3. 14.0 mT 4. 0.3 T
A superconducting solenoid is to be designed to generate a magnetic field of 10 T. If the solenoid winding has 2000 turns/meter, what is the required current? (µ 0 = 4∏ x 10 -7 A-m/T) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 1000 A 2. 1990 A 3. 3980 A 4. 5000 A

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An incredible amount of electrical energy passes down the Oklahoma at a distance of 9 km from a large tornado showed an almost constant magnetic field of 1.5 x 10 -8 T associated with the tornado. What was the average current -going down the funnel? (µ 0 = 4∏ x 10 -7 A-m/T) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 150 A 2. 250 A 3. 350 A 4. 500 A
Superconductors are capable of carrying very large currents with solenoid when the current is 104 A? ( µ 0 = 4∏ x 10 -7 A-m/T) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 1.25 T 2. 2.50 T 3. 6.28 T 4. 12.6 T

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In a mass spectrometer, an ion will have a smaller radius for its circular path if 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. its speed is greater 2. its mass is greater 3. its charge is greater 4. the magnetic field is weaker
lines 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. go out from the wire to infinity 2. come in from infinity to the wire 3. form circles which pass through the wire 4. form circles which go around the circle

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each carrying a current I. If the currents are flowing in opposite directions 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1.
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## This note was uploaded on 01/19/2010 for the course PHYS 200 taught by Professor Davies during the Spring '08 term at Roger Williams.

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Serway_CP_poll_ch19 - Two long parallel wires 20 cm apart...

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