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Current Electricity

Question

Wired Faculty App

The mean electric energy density between the plates of charged capacitor is (Here q = charge on the capacitor and A = area of the capacitor plate)
$\frac{q^{2}}{2 ε_{0} A^{2}}$
$\frac{q}{2 ε_{0} A^{2}}$
$\frac{q^{2}}{2 ε_{0} A}$
none of these

Solution

A.

\frac{q^{2}}{2 ε_{0} A^{2}}

Some More Questions From Current Electricity Chapter

What conclusion can you draw from the following observations on a resistor made of alloy manganin?

Current A

Voltage V

Current A

Voltage V

0.2

0.4

0.6

0.8

1.0

2.0

3.94

7.87

11.8

15.7

19.7

39.4

3.0

4.0

5.0

6.0

7.0

8.0

59.2

78.8

98.6

118.5

138.2

158.0

Answer the following questions:
A steady current flows in a metallic conductor of non-uniform cross-section. Which of these quantities is constant along the conductor: current, current density, electric field, drift speed?

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