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18. Electric Charges And Field question bank (Physics)

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Q1.

$A$ point charge '$Q$' is placed at the centre of the line joining two equal charges '$+q$' and '$+q$'. The value of '$Q$' when the system is in equilibrium is

(A)

$\frac{+q}{4}$

(B)

$\frac{+q}{2}$

(C)

$\frac{-q}{2}$

(D)

$\frac{-q}{4}$

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Q2.

An electric dipole of length $3 \text{ cm}$ is placed with its axis making an angle of $60^\circ$ with a uniform electric field of $5 \times 10^4 \text{ N/C}$. It experiences a torque of $9\sqrt{3} \text{ Nm}$. The magnitude of charge on the dipole is $(\sin 60^\circ = \frac{\sqrt{3}}{2})$

(A)

$0.6 \times 10^{-2} \text{ C}$

(B)

$1.2 \times 10^{-2} \text{ C}$

(C)

$1.8 \times 10^{-2} \text{ C}$

(D)

$2.4 \times 10^{-2} \text{ C}$

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