Exams › NEET › Physics
A positively charged particle moving due east enters a region of uniform magnetic field directed vertically upwards. The particle will
- continue to move due east
- move in a circular orbit with its speed unchanged
- move in a circular orbit with its speed increased
- gets deflected vertically upwards
Correct answer: move in a circular orbit with its speed unchanged
Solution
When a charged particle moves in a magnetic field, it experiences a force perpendicular to both its velocity and the magnetic field (Lorentz force). This force causes the particle to move in a circular path with constant speed, as the magnetic force does no work on the particle.
Related NEET Physics questions
- An alternating electric field, of frequency ν, is applied across the dees (radius = R) of a cyclotron that is being used to accelerate protons (mass = m). The operating magnetic field (B) used in the cyclotron and the kinetic energy (K) of the proton beam, produced by it, are given by:
- A proton carrying 1 MeV kinetic energy is moving in a circular path of radius R in uniform magnetic field. What should be the energy of an α-particle to describe a circle of same radius in the same field?
- An electron enters a region where magnetic field (\( \vec{B} \)) and electric field (\( \vec{E} \)) are mutually perpendicular, then
- A \( 10 \, \text{eV} \) electron is circulating in a plane at right angles to a uniform field at magnetic induction \( 10^{-4} \, \text{Wb/m}^2 \) (\( = 1.0 \, \text{gauss} \)). The orbital radius of the electron is
- A uniform magnetic field acts at right angles to the direction of motion of an electron. As a result, the electron moves in a circular path of radius \( 2 \, \text{cm} \). If the speed of electron is doubled, then the radius of the circular path will be
- A deuteron of kinetic energy \( 50 \, \text{keV} \) is describing a circular orbit of radius \( 0.5 \, \text{metre} \) in a plane perpendicular to the magnetic field \( \vec{B} \). The kinetic energy of the proton that describes a circular orbit of radius \( 0.5 \, \text{metre} \) in the same plane with the same \( \vec{B} \) is
⚔️ Practice NEET Physics free + battle 1v1 →