Physics Circle home Student Login

Home›Chapters›Moving Charges and Magnetism PYQs›Moving Charge in a Magnetic Field›Question 102

NEET 2013 · Moving Charge in a Magnetic Field

Moving Charge in a Magnetic Field question from NEET 2013

Q102NEET 2013Medium

Moving Charge in a Magnetic Field

A long straight wire carries a certain current and produces a magnetic field 2 ×\times 10−-4 Wb m−2{}^{-2} at a perpendicular distance of 5 cm from the wire. An electron situated at 5 cm from the wire moves with a velocity 107 m/s towards the wire along perpendicular to it. The force experienced by the electron will be (charge on electron 1.6 ×\times 10−-19 C)

Show answer and solution

Answer: (b)

  1. B⃗\vec B of a wire is circular (tangential); velocity towards the wire is radial, so v⃗⊥B⃗\vec v\perp\vec B.
  2. F=evB=1.6×10−19×107×2×10−4F = evB = 1.6\times10^{-19}\times10^{7}\times2\times10^{-4}
  3. F=3.2×10−16 NF = 3.2\times10^{-16}\text{ N}
  4. So the answer is (b) 3.2×10−16 N3.2\times10^{-16}\text{ N}.
Report a mistake

More questions on Moving Charge in a Magnetic Field