A proton enters a magnetic field of flux density $1.5\,weber/{m^2}$ with a velocity of $2 \times {10^7}\,m/\sec $ at an angle of $30^\circ $ with the field. The force on the proton will be
  • A$2.4 \times {10^{ - 12}}\,N$
  • B$0.24 \times {10^{ - 12}}\,N$
  • C$24 \times {10^{ - 12}}\,N$
  • D$0.024 \times {10^{ - 12}}\,N$
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