- 1

23

2.

5.29 10-11 m,

. () 10-11 N/C () 108 N/C () 1014 N/C () 106 N/C () 1012 N/C

3. 5.00 10-3 kg 4.00 C.

,

; () 8.21 102 N/C () 1.22 104 N/C () 2.00 1022 N/C () 5.11 106 N/C () 3.72

103 N/C

4. 3.00 106 m/s

1.00 103 N/C.

.

; () 2.56 cm () 5.12 cm () 11.2 cm () 3.34 m () 4.24

m ()

5. (0, 1.00) m 24.00 nC. (x)

(4.00, -

2.00) m; () 1.15 N/C () -0.864 N/C () 1.44 N/C () -1.15 N/C () 0.864 N/C

7.

; () . () . ()

, .

() . ()

19.

0.300 m. 12.0 nC -18.0

nC. ()

. ()

.

.

23. ( ). ()

; ()

25.00 nC .

24. x . +Q

x = -a. x = +3a.

2keQ/a2.

.

41.

. ()

q1/q2. (i) 2 (ii) 3, (iii) 1/2, (iv) 1/3, (v)

() q1 q2; (i) -, (ii)

-, (iii) -, (iv) -, (v) .

1.5

A, B,

. (i) , (ii) , (iii) , (iv)

, (v) , (vi)

24

1. 1.00 m, 2.00 m 2.50 m

3.00 nC, -2.00 nC, -7.00 nC, 1.00 nC. 1.00 nC 4.00

nC. ; () 0 () -

5.64 102 N m2/C () -1.47 103 N m2/C () 1.47 103 N m2/C () 5.64 102 N m2/C

2. xy

1.00 N/C.

, 0.500 m xy; () 1.00 N/C

() 21.00 N/C () 0 () 0.250 N/C ()

.

4. Gauss q.

. (i) ,

; () 0 () q/20 () q/60 () q/80 ()

. (ii)

,

;

.

6. Gauss ,

.

. (i) ; () 0 () 2

() 4 () 6 (ii) ;

.

7. , 5 cm,

2 C. A . B ,

. (i)

6 cm; ()

EA > EB = 0 () EA > EB > 0 () EA = EB > 0 () 0 < EA < EB () 0 < EA < EB (ii)

4 cm; .

25

1. x 850 N/C. - x = 2.50 m; () 3.40 10-16 J () -3.40 10-16 J () 2.50 10-16 J () 22.50 10-16 J () 21.60 10-19 J

2. 1.00 104 V . ; () 1.00 104 eV () 1.60 10-15 eV () 1.60 10-22 eV () 6.25 1022 eV () 1.60 10-19 eV

3. ( = 2e, = 6.63 10-27 kg) 6.20 105 m/s A, 1.50 103 V, B, 4.00 103 V. B; () 7.91 105 m/s () 3.78 105 m/s () 2.13 105 m/s () 2.52 106 m/s () 3.01 108 m/s

4. x = 3.00 m 120 V, x = 5.00 m 190 V.

,

; () 140 N/C () -140 N/C () 35.0 N/C () -35.0 N/C

() 75.0 N/C

6. ,

-x.

x = 20.0 cm x = 60.0 cm. (i)

- () , () , () , ()

; (ii) ,

() , () , () ()

;

10. .

+0.500 C, +1.50 C, -1.00 C, -0.500 C.

10.500 C 4.50 104 V,

; () 18.0

104 V () 4.50 104 V () 0 () -4.50 104 V () 9.00 104 V

11. , .

; () . () . ()

. () . ()

.

12. x = 0 x -40.0 nC.

-20.0 nC x x = 0.500 m. (i)

() x = 0, () x = 0 x = 0.500 m, () x = 0.500

m; (ii) , ; () ,

. () . () , . (iii)

; () , x = 0. () ,

x = 0 x = 0.500 m. () , x = 0.500 m. () .