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STD 12 - 4. Moving charges and magnetism — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 12 - 4. Moving charges and magnetism4 Marks
MCQ
Two parallel beams of protons and electrons, carrying equal currents are fixed at a separation $d$. The protons and electrons move in opposite directions. $P$ is a point on a line joining the beams, at a distance $x$ from any one beam. The magnetic field at $P$ is $B$. If $B$ is plotted against $x$, which of the following best represents the resulting curve
  • A

  • B

  • ✓

  • D

✓

Answer

Correct option: C.

c
(c) The magnetic field at points to the right of the proton beam acts perpendicular to the paper inwards ($\otimes$). The magnetic field at points to the left of the electron beam acts perpendicular to the paper outwards ʘ.
Magnetic field at mid point $M$ is zero.
Magnetic field at the points closer to proton beam acts perpendicular to the paper inwards (i.e. ($\otimes$)) and at the points closer to electron beam it acts outwards i.e. ʘ. In the given options graph $(c)$ satisfies all the conditions.

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