Problem 1 (36 points, 4 points each 1. A beam of protons travels towards the bot

Question

Problem 1 (36 points, 4 points each 1. A beam of protons travels towards the bottom of the pag" ws magnetic force on them? a) Into the page b) Out of the page c) Towards the top of the page d) Towards the bottorn of the page e) Left f) Right g) There is no force "et S 2. A wire with current re with current running through it is place inside a magnetic field. What is the direction of the magnetic force on the wire? a) Into the page b) Out of the page c) Upwards d) Downwards e) Left f) Right g) There is no force 3. A loop is pulled away from a wire. What is the direction of the induced current? a) Clockwise b) Counterclockwise c) There is no induced current 4. The same loop is held stationary next to the same wire. The current through the wire is turned off The momen aftrthe curentis tuneéo inducedt net #20 a) Clockwise b) Counterclockwise c) There is no induced current

Explanation / Answer

Solution:

1 . (a) Into the page

2. (a) Into the page

(Given by the right hand rule, the magnetic force on the current carrying wire is perpendicular to both

the wire and the magnetic field.)

3. (a) Clockwise (using Lenz's law, the downward flux reduces. So the induced current is in such a direction as to increase the field.)

4. (c) There is no induced current ( since there is no motion; v=0)

5.

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