AIEEE Exam

An electron with K.E = EeV collides with a
hydrogen atom in the ground state. The collision
will be elastic -
(A) for all values of E
(B) for E < 10.2 eV
(C) for E < 13.6 eV
(D) only for E < 3.4 eV

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AIEEE Other Question

A capacitor of capacitance C is charged to a
potential difference V from a cell and then
disconnected from it. A charge + Q is now given
to its positive plate. The potential difference across
the capacitor is now A particle with a specific charge s is fired with a
speed v towards a wall at a distance d,
perpendicular to the wall. What minimum
magnetic field must exist in this region for the
particle not to hit the wall ?
(A) v/sd (B) 2v/sd
(C) v/2sd (D) v/4sd