Static electricity (physics only): แบบฝึกหัด

• a.

  They gain equal and opposite charges.

• b.

  They both gain the same type of negative charge.

• c.

  They both gain the same type of positive charge.

• d.

  The material that was rubbed hardest becomes more charged than the other.

• a.The field lines form concentric circles around the sphere.
• b.The field lines point radially outwards away from the sphere.
• c.The field lines point radially inwards towards the centre of the sphere.
• d.The field lines point from the north pole to the south pole of the sphere.

• a.

  The field lines are radial and point outwards away from the center of the sphere.

• b.

  The field lines are radial and point inwards towards the center of the sphere.

• c.

  The field lines are parallel and move from left to right across the sphere.

• d.

  The field lines form concentric circles around the outside of the sphere.

• a.

  The objects exert a force of attraction on each other.

• b.

  The objects exert a force of repulsion on each other.

• c.

  No force is exerted between the objects unless they are touching.

• d.

  The charges cancel each other out, making both objects neutral.

• a.

  Because the air between them becomes more conductive.

• b.

  Because the electric field lines become more spread out.

• c.

  Because the objects start to share their electrons.

• d.

  Because the electric field is strongest close to the charged object.

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