Electric charge is transferred to an irregular metallic disk as shown in figure. If σ_1, σ_2, σ_3 and σ_4 are charge densities at given points then, choose the correct answer from the options given below:

Electric charge is transferred to an irregular metallic disk as shown in figure. If $\sigma_1, \sigma_2, \sigma_3$ and $\sigma_4$ are charge densities at given points then, choose the correct answer from the options given below:

Correct answer
A
A, B and C Only
B
A and C Only
C
D and E Only
D
B and C Only

Solution

$\begin{aligned} & \sigma \propto \frac{1}{\mathrm{ROC}} \\ & (\mathrm{ROC})_1 \lt (\mathrm{ROC})_3 \lt (\mathrm{ROC})_2=(\mathrm{ROC})_4 \\ & \sigma_1 \gt \sigma_3 \gt \sigma_2=\sigma_4\end{aligned}$

Hence, the correct answer is option: 'A'.

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