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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > In the given fig. a charged particle of mass m, charge -q , and having low ( negligible ) speed enters the region between two plates of potential difference V and plate separation d, initioally headed directly toward the top plate . A uniform magnetic field of magnitude B is normal to the plane of the paper. Find the minimum value of magnetic field( B) such that the electron will not strike the top plate.

In the given fig. a charged particle of mass m, charge -q , and having low ( negligible ) speed enters the region between two plates of potential difference V and plate separation d, initioally headed directly toward the top plate . A uniform magnetic field of magnitude B is normal to the plane of the paper. Find the minimum value of magnetic field( B) such that the electron will not strike the top plate.

(b) distance travelled in the magnetic field (c) impulse of magnetic force. A positive charge particle of charge q and mass m enters into a uniform magnetic field with velocity v as shown in Fig. There is no magnetic field to the left of PQ. Find (a) time spent and having low ( negligible ) speed enters the region between two plates of potential difference V and plate separation d charge -q Electrons in a beam are accelerated from rest through a potential difference ΔV. The beam enters an experimental chamber through a small hole. As shown in Fig. 1.35 In the given fig. a charged particle of mass m the electron velocity vector lie within a narrow cone of half angle ϕ oriented along the beam axis. We wish to use a uniform magnetic field directed parallel to the axis to focus the beam