Question

An electron and a proton are situated in a uniform electric field. The ratio of their acceleration will be

• A. Zero
• B. Unity
• C. Ratio of masses of proton and electron
• D. Ratio of masses of electron and proton

Answer 1

Answer: (C)

$a=\frac{F}{m}$
force exprienced by charge q in external electric field E is $F=qE$
$\frac{a_e}{a_m}=\frac{\frac{F_e}{m_e}}{\frac{F_p}{m_p}}=\frac{m_p\left(eE\right)}{m_e\left(eE\right)}=\frac{m_p}{m_e}$ .