An electron enters into a region of uniform magnetic field of stren...

An electron enters into a region of uniform magnetic field of strength 10 webers \( / \mathrm{m}^{2} \) with a speed of \( 3 \times 10^{7} \mathrm{~m} / \mathrm{s} \) which of the following is not possible
[AMU PMT 2009]
(a) The electron may or may not experience an acceleration
(b) The electron may experience an acceleration but can continue to move with same speed
(c) The electron may experience an acceleration and continue to move with same velocity
(d) The kinetic energy of the electron remains unchanged