xavier catholic college physics motors & generators
XAVIER CATHOLIC COLLEGE
PHYSICS
MOTORS & GENERATORS
Homework 2 The Motor Effect 1. A current is passed through a coil of conducting wire as shown. Point 2 is to the front, while point 1 is to the back of the coil.
(Dobinson, 1997: 32)
a. Will the force exerted by the coil on the magnet be an attractive or repulsive one?. b. How would the general shape of the magnetic field around the coil compare to that of the bar magnet? c. In the centre of the coil, or solenoid, would the magnetic field be uniform or non-uniform if the coil had many windings? 2. Three conductors carrying similar sized currents are arranged into an equilateral triangle.
(Dobinson, 1997: 32)
a. What is the direction of the field at point X, the centre of the triangle? b. Would this direction change if the current in the lower, horizontal conductor were reversed?
H2-Motor Effect.doc
Page 1 of 2
3. Use the diagrams below to predict the direction the conductor shown moves in each magnetic field.
(Shadwick, 2004: 8)
Acknowledgements Dobinson, G. (1997) Instant Lessons in Physics Book 2 . Strathfield, Emerald City Books Shadwick, B. (2004) Surfing Physics: Motors & Generators . Marrickville, Science Press
H2-Motor Effect.doc
Page 2 of 2
PHYSICS
MOTORS & GENERATORS
Homework 2 The Motor Effect 1. A current is passed through a coil of conducting wire as shown. Point 2 is to the front, while point 1 is to the back of the coil.
(Dobinson, 1997: 32)
a. Will the force exerted by the coil on the magnet be an attractive or repulsive one?. b. How would the general shape of the magnetic field around the coil compare to that of the bar magnet? c. In the centre of the coil, or solenoid, would the magnetic field be uniform or non-uniform if the coil had many windings? 2. Three conductors carrying similar sized currents are arranged into an equilateral triangle.
(Dobinson, 1997: 32)
a. What is the direction of the field at point X, the centre of the triangle? b. Would this direction change if the current in the lower, horizontal conductor were reversed?
H2-Motor Effect.doc
Page 1 of 2
3. Use the diagrams below to predict the direction the conductor shown moves in each magnetic field.
(Shadwick, 2004: 8)
Acknowledgements Dobinson, G. (1997) Instant Lessons in Physics Book 2 . Strathfield, Emerald City Books Shadwick, B. (2004) Surfing Physics: Motors & Generators . Marrickville, Science Press
H2-Motor Effect.doc
Page 2 of 2
