Electrostatics
Q. Which of the following statements is true about electric field lines?
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A.
They can cross each other
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B.
They are always straight
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C.
They point from positive to negative
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D.
They are always circular
Solution
Electric field lines point from positive to negative charges and never cross each other.
Correct Answer: C — They point from positive to negative
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Q. Which of the following statements is true about equipotential surfaces?
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A.
They are always parallel to each other
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B.
No work is done moving a charge along them
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C.
They can intersect
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D.
They are always spherical
Solution
No work is done when moving a charge along an equipotential surface because the potential is constant.
Correct Answer: B — No work is done moving a charge along them
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Q. Which of the following statements is true regarding electric field lines?
-
A.
They can cross each other
-
B.
They are always straight
-
C.
They point from positive to negative charges
-
D.
They are always circular
Solution
Electric field lines point from positive to negative charges and never cross each other.
Correct Answer: C — They point from positive to negative charges
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