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Physics · 2026 · 3 marks
CBSE 2026 · Region 5 · Set 3 · Q25
Two point charges q_1=2 · 5 × 10^-7 C and q_2=-2 · 5 × 10^-7 C are located at points (0, 0, - 15 cm) and (0, 0, 15 cm) respectively. Find: (a) the…
Two point charges $\displaystyle \mathrm{q}_{1}=2 \cdot 5 \times 10^{-7} \mathrm{C}$ and $\displaystyle \mathrm{q}_{2}=-2 \cdot 5 \times 10^{-7} \mathrm{C}$ are located at points ($\displaystyle 0$, $\displaystyle 0$, - $\displaystyle 15$ cm) and ($\displaystyle 0$, $\displaystyle 0$, $\displaystyle 15$ cm) respectively. Find :
(a)
the electric dipole moment of the system, and
(b)
the magnitude and direction of electric field at the origin $\displaystyle (0,0,0)$.
Marking-scheme solution
(a)
$\displaystyle \mathrm{p}=\mathrm{q} \times 2 \mathrm{a}$
\[=2.5 \times 10^{-7} \times 30 \times 10^{-2}
\]
\[=75 \times 10^{-9} \mathrm{Cm}
\]
Direction: Along positive z-axis
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