Class 12

18. Electric Charges And Field question bank (Physics)

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Q1.

Three charges \(-q_1\), \(+q_2\), and \(-q_3\) are placed as shown in the figure. The x-component of the force on \(-q_1\) is proportional to:

(A)
\(\dfrac{q_2}{b^2} - \dfrac{q_3}{a^2} \sin\theta\)
(B)
\(\dfrac{q_2}{b^2} - \dfrac{q_3}{a^2} \cos\theta\) 

(C)
\(\dfrac{q_2}{b^2} + \dfrac{q_3}{a^2} \sin\theta\)
(D)
\(\dfrac{q_2}{b^2} + \dfrac{q_3}{a^2} \cos\theta\)
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Q2.

An electron is moving round the nucleus of a hydrogen atom in a circular orbit of radius \(r\). The Coulomb force \(\vec{F}\) on the electron is:

(A)
\(K \dfrac{e^2}{r^2} \hat{r}\)
(B)
\(-K \dfrac{e^2}{r^3} \hat{r}\)
(C)
\(K \dfrac{e^2}{r^3} \hat{r}\)
(D)
\(-K \dfrac{e^2}{r^2} \hat{r}\)
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