Which of the following statements is correct regarding electrostatics of conductors?

 1 The interior of the conductor with no cavity can have no excess charge in the static situation. 2 Electrostatic potential is constant throughout the volume of the conductor. 3 Electrostatic potential has the same value inside as that on its surface. 4 All of these.
Subtopic: Â Electrostatic Shielding |
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A conducting sphere of radius R is given a charge Q. The electric potential and field at the center of the sphere respectively are:

 1 Zero and $$\mathrm{Q} / 4 \pi \varepsilon_{\mathrm{o}} \mathrm{R}^2$$ 2 $$\mathrm{Q} / 4 \pi \varepsilon_{\mathrm{O}} \mathrm{R}$$ and zero 3 $$\mathrm{Q} / 4 \pi \varepsilon_{\mathrm{O}} \mathrm{R}$$ and $$\mathrm{Q} / 4 \pi \varepsilon_{\mathrm{o}} \mathrm{R}^2$$ 4 Both are zero

Subtopic: Â Electrostatic Shielding |
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Given below are two statements:
 Assertion (A): A metallic shield in the form of a hollow shell may be built to block an electric field. Reason (R): In a hollow spherical shield, the electric field inside it is zero at every point.

 1 Both (A) and (R) are true and (R) is the correct explanation of (A). 2 Both (A) and (R) are true but (R) is not the correct explanation of (A). 3 (A) is true but (R) is false. 4 (A) is false but (R) is true.
Subtopic: Â Electrostatic Shielding |
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Two concentric metallic spherical shells A and B of radii a and b respectively (b>a) are arranged such that outer shell is earthed and inner shell is charged to Q. Charge on the outer surface of outer shell will be:

1. $-\frac{Qa}{b}$

2. $Q\left(1-\begin{array}{c}\frac{a}{b}\end{array}\right)$

3. -Q

4. zero

Subtopic: Â Electrostatic Shielding |
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Two concentric conducting spherical shells carry charge Q each. The inner shell is earthed. The charge that flows into the earth is:

1. Q

2. $\frac{3\mathrm{Q}}{2}$

3. $\frac{-\mathrm{Q}}{2}$

4. $\frac{-3\mathrm{Q}}{2}$

Subtopic: Â Electrostatic Shielding |
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