Question

State whether the following are true or false, and explain why?

1. Any equipotential surface of a point charge is a sphere with the charge at its center.

2. Electric field lines run perpendicular to a surface of a conductor.

3. The equivalent capacitance of two capacitors in series is smaller than each individual capacitor.

4. The junction rule is based upon conservation of momentum, whereas the loop rule is based upon the conservation of charge.

5. Kirchhoff junction rule is valid for any multiloop circuit, except at the plates of any capacitor in that circuit.

6. A voltmeter is connected in series to measure voltage across a device.

7. Gaussian surface are real; material (including vacuum) must be present.

Answer 1

Answer 2

1. True. because fields lines are perpendicular to the point charge forming gaussian surface.

2. True. because the tangential field are abscent for metalic object.

3.True. because in series C(total)=c1 *c2 /(c1+c2).

4. False. it should be vice versa of above statement.

5.False. it is valid every where.

6.False. Volmeter in connected in parallel because it has very high resistance.

7.False. gaussian surface is hypothetical.

8.True. if vaccume is present between plates then capppacitance become zero. so enrgy =0.5 CV²

^{will become zero.}