1. Magnetism quiz

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

3. Draw the direction of the magnetic force due to the external magnetic field (2 pts each) 9.On the electron 10.On the proton 11.On the alpha particle 12.On the wire + e α I

4. Draw the direction of the magnetic force due to the current carrying wire (2 pts each) 13.On the electron 14.On the proton 15.On the alpha particle + e I α

5. Draw the direction of the magnetic force due to the current carrying loop (2 pts each) 16.On the electron 17.On the proton 18.On the alpha particle + e I α

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. #III 19.North PoleMagnetic field strength of a bar magnet’s South pole 20.Magnetic field strength at point A Magnetic field strength at point B 21.Magnetic force if the particle were a proton 22.acceleration if the particle were a proton acceleration if the particle were an electron 23.Direction of motion if the particle were a proton Direction of motion if the particle were an electron A B

8. #III 24.Magnetic force on the proton Magnetic force on the alpha particle 25.Acceleration of the proton Acceleration of the alpha particle 26.Direction of motion of the proton Direction of motion of the alpha particle 27.If the current is 2 AMagnetic field 20cm from a straight current carrying wire If the current is 4A 28.There are 5 loopsMagnetic field inside a 10- cm radius loop carrying a current of 1A There are 3 loops 29.With an air coreMagnetic field inside a solenoid With a paramagnetic core 30.With an air coreWith a diamagnetic core 31.With a ferromagnetic core With a paramagnetic core pα 30 deg

9. #III 32.At time t = 0 sMagnetic field inside a solenoid with a ferromagnetic core At time t ≠ 0 33.Of a small magnetMagnetic field strengthOf a large magnet 34.On a stationary electron Magnetic force due to an external magnetic field On an electron moving parallel to the magnetic field. 35.Permanent magnetsDifficulty of magnetizingTemporary magnets

10. Observe and … 1.Explain why the coil spins. (5 points) 2.Determine the magnetic field direction of the tiny magnet. (3 points) 3.How would you increase the spin of the motor? ( 5 points)

11. 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 10 7 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?