Electric field lines cannot cross at a point in space.

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• Electric field lines cannot cross at a point in
  space.
• true.
• false.
• none of the above.

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Consider the four field patterns shown.
Assuming there are no charges in the
regions shown, which of the patterns represent(s)
a possible electrostatic field 1. (a) 2. (b) 3.
(b) and (d) 4. (a) and (c) 5. (b) and (c) 6. some
other combination 7. None of the above.
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An electrically neutral dipole is placed in
an external field. In which situation(s) is the
net force on the dipole zero? 1. (a) 2. (c) 3.
(b) and (d) 4. (a) and (c) 5. (c) and (d) 6. some
other combination 7. none of the above
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• A nonconductor is charged and then brought near a
  conductor. Consequently,
• the two electrostatically repel each other.
• the two electrostatically attract each other.
• only the nonconductor is repelled.
• there is no electrostatic interaction at all.
• none of these.

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• If a conductor is completely surrounded by an
  outer conductor, and the two conductors are put
  into electrical contact, all of the charge
  originally on the inner conductor will flow to
  the outer conductor.
• True.
• False.

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• The electric field of a point charge always
  points away from the charge.
• true.
• false.

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• If there is no charge in a region of space, the
  electric field must be zero everywhere on a
  surface surrounding that region.
• true.
• false.

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