The vacuum chamber in a government lab is filled with a uniform electric field o

Question

The vacuum chamber in a government lab is filled with a uniform electric field of magnitude 580N/C  pointing in the negative y -direction and a uniform magnetic field of magnitude 4.1×102T  pointing in the negative z -direction. There are essentially no electric of magnetic fields outside of the chamber. Protons can be launched so that they enter the chamber traveling in the positive x -direction only.

Part A

What direction will the electric force on the protons point immediately after entering the chamber?

In the positive x -direction. In the negative x -direction. In the positive y -direction. In the negative y -direction. In the positive z -direction. In the negative z -direction. There will be no electric force.

Explanation / Answer

Here ,

Part A

as the protons are positively charged

the direction of electric force on protons will be same as the direction of electric field

NOw, as the electric field is pointing in the negative y direction

the electric force will also point in the negative y direction

hence , the correct option is In the negative y -direction.

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