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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > A charged particle enters a uniform magnetic field with velocity vector at angle of 45∘ with the magnetic field. The pitch of the helical path followed by the particle is p. the radius of the helix will be

A charged particle enters a uniform magnetic field with velocity vector at angle of 45∘ with the magnetic field. The pitch of the helical path followed by the particle is p. the radius of the helix will be

An electron is accelerated from rest through a potential difference V. This electron experiences a force F in a uniform magnetic field. On increasing the potential difference to V' the force experienced by the electron in the same magnetic field becomes 2F. Then the ratio (V'/V) is equal to