Questions in Moving Charges and Magnetism

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The radius of curvature of the path of the charged particle in a uniform magnetic field is directly proportional to
An electron has mass $9 \times {10^{ - 31}}\,kg$ and charge $1.6 \times {10^{ - 19}}C$ is moving with a velocity of ${10^6}\,m/s$, enters a region where magnetic field exists. If it describes a circle of radius 0.10 m, the intensity of magnetic field must be
A proton (mass m and charge +e) and an $\alpha - $particle (mass 4m and charge +2e) are projected with the same kinetic energy at right angles to the uniform magnetic field. Which one of the following statements will be true
A charged particle moving in a magnetic field experiences a resultant force
If the direction of the initial velocity of the charged particle is perpendicular to the magnetic field, then the orbit will be
If the direction of the initial velocity of the charged particle is neither along nor perpendicular to that of the magnetic field, then the orbit will be
Particles having positive charges occasionally come with high velocity from the sky towards the earth. On account of the magnetic field of earth, they would be deflected towards the
A 2 MeV proton is moving perpendicular to a uniform magnetic field of 2.5 tesla. The force on the proton is
A charged particle moves with velocity v in a uniform magnetic field $\overrightarrow B $. The magnetic force experienced by the particle is
A proton is moving along Z-axis in a magnetic field. The magnetic field is along X-axis. The proton will experience a force along

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