Magnetic field is uniform for y>0 and points into plane. magnetic field is uniform and points out

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4.Moving Charges and Magnetism

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The magnetic field is uniform for $y>0$ and points into the plane. The magnetic field is uniform and points out of the plane for $y<0$. A proton denoted by filled circle leaves $y=0$ in the $-y$-direction with some speed as shown below.Which of the following best denotes the trajectory of the proton?

A

B

C

D

(KVPY-2018)

Solution

$(d)$ Following Fleming's left hand rule, proton initially rotates clockwise and it enters region $y > 0$ with its velocity in positive $y$-direction.

Here in region $y > 0$, magnetic field is into plane of paper. So, proton again follows left hand rule and now tend to rotate anti-clockwise as shown below.

Standard 12

Physics

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