GATE Papers >> ECE >> 2017 >> Question No 153

Question No. 153

An electron (q1) is moving in free space with velocity 105 m/s towards a stationary electron (q2) far away. The closest distance that this moving electron gets to the stationary electron before the repulsive force diverts its path is___________ ×10-8 m.

[Given, mass of electron m = 9.11×10-31 kg, charge of electron e = 1.6 ×10-19 C, and permittivity $\varepsilon_0=\left(1/36\pi\right)\times10^{-9\;}\mathrm F/\mathrm m$]

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