COMEDK · Physics · 17. Electrostatics
A square shaped aluminium coin weighs \(0.75 \mathrm{~g}\) and its diagonal measures \(14 \mathrm{~mm}\). It has equal amounts of positive and negative charges. Suppose those equal charges were concentrated in two charges \((+Q\) and \(-Q)\) that are separated by a distance equal to the side of the coin, the dipole moment of the dipole is
- A \(3.48 \mathrm{~Cm}\)
- B \(34.8 \mathrm{~Cm}\)
- C \(343.5 \mathrm{~Cm}\)
- D \(3480 \mathrm{~Cm}\)
Answer & Solution
Correct Answer
(C) \(343.5 \mathrm{~Cm}\)
Step-by-step Solution
Detailed explanation
The mass of the aluminium coin is \(m = 0.75 \text{ g}\). The molar mass of aluminium is \(M = 27 \text{ g/mol}\). The number of moles of aluminium is \(n = \dfrac{m}{M} = \dfrac{0.75}{27} = \dfrac{1}{36} \text{ mol}\). The number of atoms in the coin is…
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