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Electric Charges And Fields

Question
CBSEENPH12039625
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Charges are placed on the vertices of a square as shown. Let E be the electric field and V the potential at the centre. If the charges on A and B are interchanged with those on D and C respectively, then

  • straight E with rightwards arrow on top remains unchanged, V changes 

  • Both straight E with rightwards arrow on top and V change

  • straight E with rightwards arrow on top and V remain unchanged
  • straight E with rightwards arrow on top changes, V remains unchanged

Solution

D.

straight E with rightwards arrow on top changes, V remains unchanged

Some More Questions From Electric Charges and Fields Chapter

a) An electrostatic field line is a continuous curve. That is, a field line cannot have sudden breaks. Why not?
b) Explain why two field lines never cross each other at any point? 

Figure shows tracks of three charged particles in a uniform electrostatic field. Give the signs of the three charges. Which particle has the highest charge to mass ratio?

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