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An electron (mass = 9x10-31 kg, charge = 1.6 x 10-19 C) moving with a velocity of 106 m/s enters a region where magnetic field exists. If itdescribes a circle of radius 0.10m, the intensity of the magnetic field must be

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a

1.8×10−4T

b

5⋅6×10−5T

c

14.4×10−5T

d

1⋅3×10−6T

answer is B.

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Detailed Solution

r=mvqB∴ 0⋅10=9×10−311061⋅6×10−19Bor B=9×10−311061.6×10−19(0⋅10)=5⋅6×10−5 tesla

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