Questions in Moving Charges and Magnetism

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An electron of mass m and charge q is travelling with a speed v along a circular path of radius r at right angles to a uniform of magnetic field B. If speed of the electron is doubled and the magnetic field is halved, then resulting path would have a radius of
If an electron enters a magnetic field with its velocity pointing in the same direction as the magnetic field, then
A particle of mass m and charge q enters a magnetic field B perpendicularly with a velocity v, The radius of the circular path described by it will be
An electron moving towards the east enters a magnetic field directed towards the north. The force on the electron will be directed
An electron (mass = 9.0×${10^{ - 31}}$kg and charge =..coulomb) is moving in a circular orbit in a magnetic field of $1.0 \times {10^{ - 4}}\,weber/{m^2}.$ Its period of revolution is
An electron (charge q coulomb) enters a magnetic field of H $weber/{m^2}$ with a velocity of $v\,m/s$ in the same direction as that of the field the force on the electron is
A homogeneous electric field E and a uniform magnetic field $\mathop B\limits^ \to $ are pointing in the same direction. A proton is projected with its velocity parallel to $\mathop E\limits^ \to $. It will
The radius of circular path of an electron when subjected to a perpendicular magnetic field is
Cyclotron is used to accelerate
Two particles A and B of masses ${m_A}$ and ${m_B}$ respectively and having the same charge are moving in a plane. A uniform magnetic field exists perpendicular to this plane. The speeds of the particles are ${v_A}$ and ${v_B}$ respectively, and the trajectories are as shown in the figure. Then Question Image

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