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Chapter 16: Q6MCQ (page 443)
As an object acquires a positive charge, its mass usually
(a) decreases.
(b) increases.
(c) stays the same.
(d) becomes negative.
The correct answer is option (a) decreases
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(II) Determine the direction and magnitude of the electric field at the point P in Fig. 16–56. The charges are separated by a distance 2a, and point P is a distance x from the midpoint between the two charges. Express your answer in terms of Q, x, a, and k.
(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?
(II) The field just outside a 3.50-cm-radius metal ball is \({\bf{E = 3}}{\bf{.75 \times 1}}{{\bf{0}}^{\bf{2}}}\;{\bf{N/C}}\) and points toward the ball. What charge resides on the ball?
Draw the electric field lines surrounding two negative electric charges a distance l apart.
Consider the electric field at the three points indicated by the letters A, B, and C in Fig. 16–49. First draw an arrow at each point indicating the direction of the net force that a positive test charge would experience if placed at that point, then list the letters in order of decreasing field strength (strongest first). Explain.
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