Two identical pith balls supported by insulating threads hang side by side and close together, as shown below.
One is positively charged; the other is neutral. We can conclude that
A. all field lines leaving the positively charged pith ball end on the neutral pith ball.
B. some of the field lines leaving the positively charged pith ball end on the neutral pith ball.
C. none of the field lines leaving the positively charged pith ball end on the neutral pith ball.
D. positive charge is transferred along the field lines until both balls have equal charges.
E. positive charge is transferred along the field lines until both balls hang along vertical lines.
Answer: B
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The first of two identical boxes of mass m is sitting on level ground. The second box is sitting on a ramp that makes a 20° angle with the ground. The normal force of the level ground on the first box is 
; the normal force of the ramp on the second box is 
. Which statement is correct?
A.
= = mg.B.
= mg; = mg sin 20°.C.
= mg; = mg cos 20°.D.
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What will be an ideal response?
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