CBSE 2026 · Region 5 · Set 3 · Q25 · 3 marks
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 $\displaystyle (0,0,0)$.
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
Electric Charges and FieldsElectric DipoleApplyshort_answermedium
More from Electric Charges and Fields
- (i) Two point charges +q and -q are held at (a, 0) and ( -a, 0 ) in x-y plane. Obtain an expression for the…2025 · asked 3×
- An electric dipole consists of two point charges q and -q separated by a distance 2a. Derive an expression…2026 · asked 3×
- (i) Define electric flux and write its SI unit. (ii) Use Gauss' law to obtain the expression for the electric…2023 · asked 3×
- Two small solid metal balls A and B of radii R and 2 R having charge densities 2 σ and 3 σ respectively are…2025 · asked 3×
- (i) The electric field in a region is given by E=40 x i N / C. Find the amount of work done in taking a unit…2025 · asked 3×
- Four point charges of 1 μ C,-2 μ C, 1 μ C and -2 μ C are placed at the corners A, B, C and D respectively, of…2024 · asked 3×
- (i) Use Gauss' law to obtain an expression for the electric field due to an infinitely long thin straight…2023 · asked 3×
- Which one of the following statements is correct? Electric field due to static charges is2025 · asked 3×
CBSE Class 12 Physics past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.