xavier catholic college physics
XAVIER CATHOLIC COLLEGE
PHYSICS
MOTORS & GENERATORS
Worksheet 4: • 1.4a
Students : solve problems using:
F II =k 1 2 l d
Parallel Wires
(Shadwick, 2004: 15)
1. Two long, parallel, current carrying wires attract each other with force F. The current
in each, and the distance between them, is doubled. Predict the new force between the wires.
W4-1.4a-F÷l=kII÷d.doc
Page 1 of 4
2. Two long, parallel, current carrying conductors are separated by d metres. All other variables are kept constant. a. Draw a graph to show the relationship you would expect to find between the force between the wires, F, and the distance between them, d.
b. Draw a graph to show the relationship you would expect to find between the force between the wires, F, and the current flowing in one of them.
3. Calculate the force between two parallel wires, each 0.3 m long, 2.0 cm apart, and carrying currents of 6 A and 12 A in opposite directions.
W4-1.4a-F÷l=kII÷d.doc
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4. AB and CD are two parallel conductors. If the current in AB is 0.5 A, in CD is 2.0 A in the same direction, and AB is 0.25 m long, and 0.04 m from CD, calculate the force per unit length between the wires.
5. Two wires are 0.35 m apart and carry current of 2.5 and 3.0 A east. The force between them is 8.57 x 10-7 N. Calculate their common length..
6. An attractive force of 6 x 10-6 N acts between two 0.1 m long wires 0.12 m apart. One carries 1.5 ampere east. Calculate the current, and its direction, in the other wire.
7. Predict what happens to the force between two parallel conductors if the distance between them is halved and the current in one wire doubled and reversed.
W4-1.4a-F÷l=kII÷d.doc
Page 3 of 4
8. Three current carrying conductors, T, U and V, are set up as shown in Figure 9.2. Calculate the force per unit length acting on each wire due to the other two wires.
(Shadwick, 2004: 15)
Answers:
ACKNOWLEDGEMENTS Shadwick, B. (2004) Surfing Physics Motors and Generators. Marrickville, Science Press
W4-1.4a-F÷l=kII÷d.doc
Page 4 of 4
PHYSICS
MOTORS & GENERATORS
Worksheet 4: • 1.4a
Students : solve problems using:
F II =k 1 2 l d
Parallel Wires
(Shadwick, 2004: 15)
1. Two long, parallel, current carrying wires attract each other with force F. The current
in each, and the distance between them, is doubled. Predict the new force between the wires.
W4-1.4a-F÷l=kII÷d.doc
Page 1 of 4
2. Two long, parallel, current carrying conductors are separated by d metres. All other variables are kept constant. a. Draw a graph to show the relationship you would expect to find between the force between the wires, F, and the distance between them, d.
b. Draw a graph to show the relationship you would expect to find between the force between the wires, F, and the current flowing in one of them.
3. Calculate the force between two parallel wires, each 0.3 m long, 2.0 cm apart, and carrying currents of 6 A and 12 A in opposite directions.
W4-1.4a-F÷l=kII÷d.doc
Page 2 of 4
4. AB and CD are two parallel conductors. If the current in AB is 0.5 A, in CD is 2.0 A in the same direction, and AB is 0.25 m long, and 0.04 m from CD, calculate the force per unit length between the wires.
5. Two wires are 0.35 m apart and carry current of 2.5 and 3.0 A east. The force between them is 8.57 x 10-7 N. Calculate their common length..
6. An attractive force of 6 x 10-6 N acts between two 0.1 m long wires 0.12 m apart. One carries 1.5 ampere east. Calculate the current, and its direction, in the other wire.
7. Predict what happens to the force between two parallel conductors if the distance between them is halved and the current in one wire doubled and reversed.
W4-1.4a-F÷l=kII÷d.doc
Page 3 of 4
8. Three current carrying conductors, T, U and V, are set up as shown in Figure 9.2. Calculate the force per unit length acting on each wire due to the other two wires.
(Shadwick, 2004: 15)
Answers:
ACKNOWLEDGEMENTS Shadwick, B. (2004) Surfing Physics Motors and Generators. Marrickville, Science Press
W4-1.4a-F÷l=kII÷d.doc
Page 4 of 4
