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An electron moving horizontally with a velocity of 4 × 10^4 m/s enters a region of uniform magnetic field of 10^–5 T acting vertically

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An electron moving horizontally with a velocity of 4 × 104 m/s enters a region of uniform magnetic field of 10–5 T acting vertically upward as shown in the figure. Draw its trajectory and find out the time it takes to come out of the region of magnetic field.

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If Ampere’s force acts in upward direction and balances the weight, that is, Fm = mg

BII = mg

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