Chapter 16: Q18Q (page 443)
Why can electric field lines never cross?
If the electric field lines cross at a location, the direction of the electric field at the same point is in the various direction that is impossible. That is why electric field lines never cross.
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(I) A downward electric force of 6.4 N is exerted on a\( - {\bf{7}}{\bf{.3}}{\rm{ }}\mu {\bf{C}}\)charge. Find the magnitude and direction of the electric field at the position of this charge.
When determining an electric field, must we use a positive test charge, or would a negative one do as well? Explain.
(III) Two charges, \( - {\bf{Q}}\) and \( - {\bf{3Q}}\) are a distance l apart. These two charges are free to move but do not because there is a third (fixed) charge nearby. What must be the magnitude of the third charge and its placement in order for the first two to be in equilibrium?
A positively charged rod is brought close to a neutral piece of paper, which it attracts. Draw a diagram showing the separation of charge in the paper and explain why attraction occurs.
Explain why fog or rain droplets tend to form around ions or electrons in the air.
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