Student Login

Home›Chapters›Moving Charges and Magnetism PYQs›Moving Charge in a Magnetic Field›Question 98

NEET 2015 (AIPMT) · Moving Charge in a Magnetic Field

Moving Charge in a Magnetic Field question from NEET 2015 (AIPMT)

Q98NEET 2015 · AIPMTMedium

Moving Charge in a Magnetic Field

A proton and an alpha particle both enter a region of uniform magnetic field B, moving at right angles to the field B. If the radius of circular orbits for both the particles is equal and the kinetic energy acquired by proton is 1 MeV, the energy acquired by the alpha particle will be

Show answer and solution

Answer: (b)

For equal $r$ in the same $B$ : $K = \dfrac{q^2B^2r^2}{2m} \Rightarrow K \propto \dfrac{q^2}{m}$ .
Proton: $\dfrac{e^2}{m}$ ; alpha: $\dfrac{(2e)^2}{4m} = \dfrac{e^2}{m}$ , the same.
$K_\alpha = K_p = 1$ MeV
So the answer is (b) 1 MeV.

Report a mistake

More questions on Moving Charge in a Magnetic Field

A proton (mass m) accelerated by a potential difference V flies through a uniform…JEE Main 2015 (10 Apr, Shift 1)
A positive charge 'q' of mass 'm' is moving along the + x axis. We wish to apply a…JEE Main 2014 (12 Apr, Shift 1)
A particle of charge 16 × 10⁻¹⁶ C moving with velocity 10 ms ⁻¹ along x-axis enters a…JEE Main 2013 (23 Apr, Shift 1)
A long straight wire carries a certain current and produces a magnetic field 2 × 10 - 4…NEET 2013
When a proton is released from rest in a room, it starts with an initial acceleration a 0…NEET 2013
A proton carrying 1 MeV kinetic energy is moving in a circular path of radius R in…NEET 2012 (AIPMT, Mains)
Proton, deuteron and alpha particle of same kinetic energy are moving in circular…JEE Main 2012 (AIEEE)
An alternating electric field, of frequency v, is applied across the dees (radius = R) of…NEET 2012 (AIPMT, Prelims)