State whether each statement is true , false , always false , or true in certain

Question

State whether each statement is true, false, always false, or true in certain circumstances (if always false or true in certain circumstances, explain):

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 the motion of a positive charge.

4. The electric field caused by two fixed point charges can equal zero only at the 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. All objects with electric charge also have mass. ------true always

2. Electrons move in the direction of the electric field.    ----- false

3. The electric field points in the direction of the motion of a positive charge. -- true always

4. The electric field caused by two fixed point charges can equal zero only at the point between them

(except for infinitely far away). --- true sometimes

5. The electric potential is zero where the electric field equals zero.   false

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. always true

8. Equal charges placed on a perfect conductor distribute themselves evenly throughout the conductive material. --- true

9. Charges placed on a dielectric (insulating material) remain in place and do not move. ---flase

10. Electric lines of force begin and end on electric charges. true

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. true

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