Ohm's Law in Scalar Form

Q.

what is relative error? what is the difference between absolute error and relative error?

Q. Find the maximum electric field due to a uniformly charged ring of charge $Q$ and radius $R$ along the axis of the ring $[K=\frac{1}{4\pi {ϵ}_0}]$

1. $\frac{KQ}{\sqrt{3}{R}^2}$
2. $\frac{KQ}{3\sqrt{3}{R}^2}$
3. $\frac{2KQ}{3\sqrt{3}{R}^2}$
4. $\frac{2KQ}{\sqrt{3}{R}^2}$

Q. From the graph between current i & voltage V shown, identify the portion corresponding to negative resistance

1. DE
2. CD
3. BC
4. AB

Q. Figure represents a part of the closed circuit. If a current of 2A flows in from A, the potential difference between points A and B $(V_A-V_B)$ is

1. + 9 V
2. – 9 V
3. + 3 V
4. + 6 V

Q. From the graph between current $I$ and voltage $V$ is shown. Identify the portion corresponding to negative resistance

Q. In the following circuit diagram fig. the lengths of the wires AB and BC are same but the radius of AB is three times that of BC. The ratio of potential gradients at AB and BC will be

1. 1 : 9
2. 9 : 1
3. 3 : 1
4. 1 : 3

Q. two combination of resis†an ces r1=600\pm18, r2=300\pm6 ohm are connected in parrelel. the equivalent resis†an ce of the combination is