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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > A particle of charge q and mass m starts moving from the origin under the action of an electric field E =E o ​ i ^ and B =B 0 ​ i ^ with a velocity v = v 0 ​j ^ ​ . The speed of the particle will become 2v 0 ​ after a time

A particle of charge q and mass m starts moving from the origin under the action of an electric field E =E o ​ i ^ and B =B 0 ​ i ^ with a velocity v = v 0 ​j ^ ​ . The speed of the particle will become 2v 0 ​ after a time

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