A proton accelerated by a potential difference $500\;KV$ moves though a transverse magnetic field of $0.51\;T$ as shown in figure. The angle $\theta $through which the proton deviates from the initial direction of its motion is......$^o$
  • A${15}$
  • B${30}$
  • C${45}$
  • D${60}$
Diffcult
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