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CUET

Q30. An alpha-particle moves with a speed of (5 x 10⁵î)ms⁻¹. It enters a region where there is a magnetic field of magnitude 4T, directed at an angle of 45° to the X-axis and lying in XY plane. The magnitude of magnetic force on alpha particle is: (a) 1.6 x 10⁻¹⁴ N (b) 3.2 x 10⁻¹³ N (c) 4.5 x 10⁻¹³ N (d) 1.6 x 10⁻¹³ N