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Electric potential, Electric field, Electricity

Short Answers Chapter 33 Electric Fields and Potential

Review Questions 529
1.Interaction between things physically far apart
2.Have actual “contact” between thing and field
3.Both are means of exerting forces
4.Has magnitude and direction
5.a.Lines depicting Electrical Fieldb.Same
6.Closer lines, stronger field; farther apart, weaker
7.Parallel, equally spaced lines
8.Charge on outside; field inside cancels to zero
9.Zero, field inside cancels to zero
10.a.No, only +, no -b,Yes, both + and -
11.Work = change in potential energy plus possible changes in other energy forms 12.By doing work on it against an electric field
13.Convert to Kinetic Energy
14.Electric potential = electric potential energy/charge
15.More joules per more coulomb = same potential, j/c = J/C 16.Volt, 1 volt = 1 joule/coulomb
17.No, potential = Potential Energy/charge as if test charge is present 18.Ratio can be high when charge is small
19.None on inside, all charge repels to outside
20.About 3 million volts

Think and Explain 530
1.Acts on charge, both + and - , can be shielded
2.By convention, direction is that of force on positive test charge 3.Electrons have a greater acceleration, opposite direction; electrons first 4.1/4 as much, inverse-square law
5.Mutual repulsion
6.Greater at corners; see Figure 33.8
7.Only if same charge, V = PE/q; PE = Vq
8.Similar, both low energy though high energy per unit quantity 9.Zero, because plate charges equal and opposite
10.Hair strands charged same sign; mutual repulsion

Think and Solve 530
1.a.12 000 voltsb.12 Joules; conservation of energy
2.a.12 Joule, same as for #1b.24 Joules
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