Verified Solution • 2025–26 Session moderate

QJEEM19Ph2537: JEE Main 2019 Physics - Class 11 JEEM19Ph2537 Solution: In an experiment, electrons are accelerated, from rest, by…

In an experiment, electrons are accelerated, from rest, by applying a voltage of 500 V. Calculate the radius of the path if a magnetic field 100 mT is then applied. [Charge of the electron = 1.6 × 10–19 C Mass of the electron = 9.1 × 10–31 kg]

Multiple Choice Options

  • A 7.5 × 10−4 m
  • B 7.5 × 10−3 m
  • C 7.5 m
  • D 7.5 × 10−2 m

Step-by-Step Verified Solution

r=2mkeB=2meΔveB

r=2me.ΔvB=2×9.1×10−311.6×10−19(500)100×10−3

r=9.10.16×10−1010−1=34×10−4

   =7.5×10−4

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