Two point charges whose magnitudes are -3 x 10⁻⁹ C and 3 x 10⁻⁹ C are separated by a distance of 3 c

Question

Two point charges whose magnitudes are -3 x 10⁻⁹ C and 3 x 10⁻⁹ C are separated by a distance of 3 cm. An electron is released from rest between the two charges. What is its velocity when it is 1 cm from the negative charge?

(k = 1/(4πε₀) = 9 x 10⁹ Nm²C⁻²)

(Mass of an electron, mₑ = 9.1 x 10⁻³¹ kg, Charge on an electron, e = 1.6 x 10⁻¹⁹ C)

Answer 1

Two point charges whose magnitudes are -3 x 10⁻⁹ C and 3 x 10⁻⁹ C are separated by a distance of 3 cm. An electron is released from rest between the two charges. What is its velocity when it is 1 cm from the negative charge?

(k = 1/(4πε₀) = 9 x 10⁹ Nm²C⁻²)

(Mass of an electron, mₑ = 9.1 x 10⁻³¹ kg, Charge on an electron, e = 1.6 x 10⁻¹⁹ C)

3.42 x 10⁷ ms⁻¹
2.18 x 10⁷ ms⁻¹ ✓
4.38 x 10⁷ ms⁻¹
1.72 x 10⁷ ms⁻¹

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