An electron is moving as shown in the diagram below (x to the right , y up, zout

Question

An electron is moving as shown in the diagram below (x to the right , y up, zout of page). At the location A what is the direction of the magnetic field made by the electron? circle the letter of your choice: At the location B what is the direction of the magnetic field made by the electron? Circle the letter of your choice: At the location C what is the direction of the magnetiv field by the electro? Circle the letter of your choice: A proton is placed at the location C, travelling in the +x direction. What is the direction of the magnet force acting on the proton due to the electron? Circle the letter of your choice:

Explanation / Answer

These are all by the right hand rule.

Part A)

The B field is zero since point A is directly behind the electron's movement

Part B)

At location B, the B field is out of the page. That is positive z direction.

Part C)

At location C, the B field is into the page. That is negative z direction.

Part D)

Since the electron and proton are moving in the same direction, parallel to each other, they are repelled

Thus the proton is forced upwards. That is the positive y direction.

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