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Understanding Magnetic Fields and Forces: A Comprehensive Quiz

This quiz covers key concepts in magnetism, including the drawing of magnetic field lines, understanding magnetic forces acting on charged particles in different scenarios, and comparing various magnetic quantities. Students will explore magnetic field direction due to external sources, current-carrying wires, and loops, as well as the factors affecting motor spin. The quiz includes both theoretical and numerical questions related to forces on charged particles in varying orientations with respect to a current-carrying wire. Engage with magnetism's fascinating principles!

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Understanding Magnetic Fields and Forces: A Comprehensive Quiz

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  1. Magnetism quiz

  2. Draw the magnetic field lines (3 pts each) N 1. S 4. 5. N I S 6. I e 2. 3. + 7. 8. e I

  3. Draw the direction of the magnetic force due to the external magnetic field (2 pts each) e • On the electron • On the proton • On the alpha particle • On the wire + I α

  4. Draw the direction of the magnetic force due to the current carrying wire (2 pts each) e α • On the electron • On the proton • On the alpha particle + I

  5. Draw the direction of the magnetic force due to the current carrying loop (2 pts each) • On the electron • On the proton • On the alpha particle e α + I

  6. Compare the quantities in columns I & II Write • A if the quantity in I is greater than the quantity in II • B if the quantity in II is greater than the quantity in I • C if the quantities in I &II are equal • D if the quantities in I &II cannot be compared

  7. A B

  8. p α 30 deg

  9. Observe and … • Explain why the coil spins. (5 points) • Determine the magnetic field direction of the tiny magnet. (3 points) • How would you increase the spin of the motor? ( 5 points)

  10. Show your solution. A long straight wire carries a current of 100A. (a) What is the force on an electron moving parallel to the wire, in the opposite direction to the current, at a speed of 1.0 x 107 m/s when it is 10cm from the wire? (b) What is the force on the electron under the same circumstances when it is moving perpendicularly toward the wire?

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