Electricity Conceptual Analysis Homework. For each statement, decide whether it

Question

Electricity Conceptual Analysis Homework.
For each statement, decide whether it is always true, always false or true in certain circumstances. State which case applies to the statement, describing why you chose the answer you did and cite an experiment or principle of Physics which supports` your claim.

[1] All objects with electric charge also have mass.
[2] Electrons move in the direction of the electric field.
[3] The electric field points in the direction of motion of a positive charge.
[4] The electric field caused by two fixed point charges can equal zero only at point between them (except for infinitely far away).
[5] The electric potential is zero where the electric field equals zero.
[6] Electric field lines pass through an uncharged perfect conductor with no change in direction.
[7] The electric potential inside a perfect conductor equals zero.
[8] Equal charges placed on a perfect conductor distribute themselves evenly throughout the conductive material.
[9] Charges placed on a dielectric (insulating material) remain in place and do not move.
[10] Electric lines of force begin and end on electric charges.
[11] An uncharged, perfectly conducting shell surrounds a positively charged, spherical object. The charge on the outside of the conducting shell has the same magnitude but opposite sign of the charge on the sphere.

Explanation / Answer

1) Always true. The quantity on which charge is quantized is electronic charge and it denotes charge on electron which also has a mass of 9.1 x 10-31 kg.

2) Always False. If the electric field is due to a positive charge, it will move towards positive charge i.e opposite to electric field direction, and vice versa.

3) Always true. If the electric field is due to a positive charge, it will move away from positive charge i.e parallel to electric field direction, and vice versa.

4) True in certain circumstances, it is only true when both the fixed charge are of same sign.

5) True in certain circumstances, Consider the following example to show that it is possible to have a zero electric field, and a positive electric potential at a given point.

If you have two positive point charges that are separated from each other, there is a point between them where the electric field is zero. The electric field of each is a vector quantity, and the two vectors cancel each other. The electric potential is a scalar quantity, and at the same point it is the sum of the two values.

6) Always false, conductors cannot contain electric field lines so the lines deviate.

7) Always true, The charges along the surface all act equally and opposite to one another, and their sum at any point is equal to zero.

8) Always true, the free electrons get distributed uniformly throughout the surface.

9) True in certain case, they will move if an externa force is applied.

10) True in certain case, it is true when two opposite charges are placed opposite to each other.

11) Always false, it will be of same magnitude and same sign.

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