The surface charge density of a very large surface is —3.0 X 10⁻⁶Cm⁻². From what distance should an electron of 150 eV energy be projected towards the plane so that its velocity becomes zero on reaching the plane ? Charge of an electron = 1.6 X 10⁻¹⁹C,1 eV = 1.6 x 10⁻¹⁹J, ε₀ = 9 X 10⁻¹² SI.

The surface charge density of a very large surface is —3.0 X 10⁻�

1.	The surface charge density of a very large surface is —3.0 X 10⁻⁶Cm⁻². From what distance should an electron of 150 eV energy be projected towards the plane so that its velocity becomes zero on reaching the plane ? Charge of an electron = 1.6 X 10⁻¹⁹C,1 eV = 1.6 x 10⁻¹⁹J, ε₀ = 9 X 10⁻¹² SI.
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