Physics · JEE | Electric Charges and Fields

What is the time required for an electron of mass \( m_e \) starting from rest to fall through a distance \( h \) in a uniform electric field \( E \)?

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Correct answer · Option A

\( t_e = \sqrt{\frac{2h m_e}{e E}} \)

Using kinematic equation \( h = \frac{1}{2}a_e t_e^2 \) where \( a_e = \frac{eE}{m_e} \), we get \( t_e = \sqrt{\frac{2hm_e}{eE}} \).