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Check yourself Answers

1The student is wrong. Positive charges are fixed and cannot move.

2Since E∝1 r 2 and r is doubled E will decrease by a factor of 4.

3

4Field lines cannot cross since at the crossing point the direction of the field would not be defined.

5It is the same everywhere because the electric field is uniform.

6

7

8 aRepulsion;

battraction.

9Out of the page

103.0 × 108 m s−1, the speed of light in a vacuum. This is worth looking into!