A proton is released from rest, 10  cm from a charged sheet carrying charged density of -2.21 × 1...

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A proton is released from rest, 10  cm from a charged sheet carrying charged density of -2.21 × 10^-9C / m^2. It will strike the sheet after the time (approximately)
(a) 4 μs
(b) 2 μs
(c) 2 √(2)μ
(d) 4 √(2)μs

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