Question

# An electron gun ‘G’ emits electrons of energy 2 keV travelling in the positive X direction. The electrons are required to hit the spot ‘S’ where GS = 0.1 m and the line GS makes an angle of 60∘ with the x-axis. A uniform magnetic field ‘B’ parallel to GS exists in the region outside the gun. The minimum value of B needed to make the electron hit ‘S’ is

A
4.74×103T
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B
4.41×103T
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C
3×103T
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D
2.21×103T
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