An alpha-particle moves with a speed of $(5×10^5\hat i) m s^{-1}$. It enters a region where there is a magnetic field of magnitude 4 T, directed at an angle of 45° to the X-axis and lying in XY plane. The magnitude of magnetic force on alpha particle is:

$1.6 × 10^{-14} N$ $3.2 × 10^{-13} N$ $4.5 × 10^{-13} N$ $1.6× 10^{-13} N$

$4.5 × 10^{-13} N$

The correct answer is Option (3) → $4.5 × 10^{-13} N$