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A proton enters a magnetic field of flux density \( 1.5 \mathrm{Wbm}^{-2} \) with a velocity of \( 2 \times 10^{7} \mathrm{~ms}^{-1} \) at an angle of \( 30^{\circ} \) with the field. The force on the proton - will be
(a) \( 2.4 \times 10^{-12} \mathrm{~N} \)
(b) \( 0.24 \times 10^{-12} \mathrm{~N} \)
(c) \( 24 \times 10^{-12} \mathrm{~N} \)
(d) \( 0.024 \times 10^{-12} \mathrm{~N} \)
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