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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > A particle of positive charge q and mass m enters with velocity V j ^at the origin in a magnetic field B(− k ^ ) which is present in the whole space. The charge makes a perfectly inelastic collision with an identical particle (having same charge ) at rest but free to move at its maximum positive y−coordinate. After collision, the combined charge will move on trajectory (where r = qB /mV ​ ) :

A particle of positive charge q and mass m enters with velocity V j ^at the origin in a magnetic field B(− k ^ ) which is present in the whole space. The charge makes a perfectly inelastic collision with an identical particle (having same charge ) at rest but free to move at its maximum positive y−coordinate. After collision, the combined charge will move on trajectory (where r = qB /mV ​ ) :

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