Consider the following four situations(A, B, C, D), in which there is a uniform

Question

Consider the following four situations(A, B, C, D), in which there is a uniform electric field in the x direction and a uniform magnetic field in the y direction. Find the direction of the magnetic force on the proton for each situation.

Please tell me how you got the answer, too.

Thanks!

Consider the following four situations(A, B, C, D), in which there is a uniform electric field in the x direction and a uniform magnetic field in the y direction. Find the direction of the magnetic force on the proton for each situation. Please tell me how you got the answer, too. Thanks!

Explanation / Answer

Use the 'thumb rule'
If you put your right hand in a thumbs up shape with your index finger pointed out and other three curled in, your thumb is magnetic field B, and your three fingers give the direction of the proton.

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