Preview

Youngster

Satisfactory Essays
Open Document
Open Document
2593 Words
Grammar
Grammar
Plagiarism
Plagiarism
Writing
Writing
Score
Score
Youngster
CHAPTER – 29

ELECTRIC FIELD AND POTENTIAL
EXERCISES
1. 0 =

Coulomb 2 Newton m kq1q2 2

=l M L T

1

–1 –3 4

F= 2.

r2 3 q1 = q2 = q = 1.0 C distance between = 2 km = 1 × 10 m kq1q2 r
2

so, force =

F=

(9  10 9 )  1 1 (2  10 )
3 2

=

9  10 9 2 2  10 6

= 2,25 × 10 N

3

The weight of body = mg = 40 × 10 N = 400 N So,

 2.25  10 3 wt of body =   4  10 2 force between ch arg es 

   

1

= (5.6)

–1

=

1 5 .6

3.

So, force between charges = 5.6 weight of body. q = 1 C, Let the distance be  F = 50 × 9.8 = 490 F=

Kq 2 2

 490 =
3

9  10 9  12 2

or  =

2

9  10 9 6 = 18.36 × 10 490

4.

  = 4.29 ×10 m charges ‘q’ each, AB = 1 m wt, of 50 kg person = 50 × g = 50 × 9.8 = 490 N FC =
2

kq1q2 r
2

 =

kq2 r2

= 490 N

q = q= 5.

490  r 2 9  10
9

490  1 1 9  10 9
–5

54.4  10 9 = 23.323 × 10

coulomb ≈ 2.3 × 10
–19

–4

coulomb

Charge on each proton = a= 1.6 × 10 coulomb –15 Distance between charges = 10 × 10 metre = r = 9 × 2.56 × 10 = 230.4 Newton r 10  30 –6 –6 q2 = 1.0 × 10 r = 10 cm = 0.1 m q1 = 2.0 × 10 Let the charge be at a distance x from q1 kqq 2 Kq1q q1 F1 = F2 = 2  (0.1  )2
2

Force =

kq2

=

9  10 9  1.6  1.6  10 38

6.

q xm (0.1–x) m 10 cm q2

=

9.9  2  10 6  10 9  q 2
 f 1 = f2

Now since the net force is zero on the charge q. 

kq1q 2

=

kqq 2 (0.1  )2
2 2

 2(0.1 – ) =  =

 2 (0.1 – ) =  From larger charge 29.1

0 .1 2 1 2

= 0.0586 m = 5.86 cm ≈ 5.9 cm

Electric Field and Potential 7. q1 = 2 ×10 c q2 = – 1 × 10 c r = 10 cm = 10 × 10 Let the third charge be a so, F-AC = – F-BC 
–6 –6 –2

m
10 × 10–10 m

kQq1 r12
2

=

KQq2 r2
2
2



2  10 6 (10  )
2

=

1  10 6 
2

A 2 × 10–6 c

C B –1 × 10–6 c

a

 2 = (10 + )  8.

2  = 10 +   ( 2 - 1) = 10   =

10 = 24.14 cm  1.414  1

So,

You May Also Find These Documents Helpful

  • Satisfactory Essays

    Nt1310 Unit 4

    • 775 Words
    • 4 Pages

    Part III PHYSICS HSE II Time:2Hours Max:60 Scores 1. Three identical charges each +q are placed at the corners of an equilateral triangle of side d cm. Calculate the force on a +ive charge +2q at the centroid of the triangle. 2 2.If the earth is supposed to be a metallic sphere,its capacity will be nearly (a) 700pf (b) 700 microfarad (c) 700f (d) 6.4 X10^6 f 1score 3. write the relation between dielectric constant and electric susceptibility. 1score 4. A box encloses an electric dipole consisting of charge 5micro C and -5micro C and of length 10cm. What is the total electric flux through the box? 2scores 5. Find the ratio of the p.d that must be applied across the (1)parallel (2) series combination of two identical capacitors so that the energy stored in the two cases becomes the same. 2 scores 6.(a)…

    • 775 Words
    • 4 Pages
    Satisfactory Essays
  • Good Essays

    Nt1310 Unit 1 Study Guide

    • 5747 Words
    • 23 Pages

    Q 10. Three charges, each equal to +2C are placed at the corners of an equilateral triangle. If the force between any two charges be F, then what will be the net force on either Charge? 11. A point charge q is placed at O as…

    • 5747 Words
    • 23 Pages
    Good Essays
  • Powerful Essays

    Nt1310 Unit 4 Lab Report

    • 5478 Words
    • 22 Pages

    have been used to be bombarded by the α-particles. If the thin foil of light atoms like aluminium etc. is used, what difference would be observed from the above results?…

    • 5478 Words
    • 22 Pages
    Powerful Essays
  • Good Essays

    ch 16 lab

    • 804 Words
    • 5 Pages

    9) If a second positive charge were introduced and moved from the first equipotential line created to the second line (closer to the charge),…

    • 804 Words
    • 5 Pages
    Good Essays
  • Satisfactory Essays

    Week 2 PH220

    • 359 Words
    • 2 Pages

    The box is 7.93 kg. 7.93kg * 9.8 = 77.71 N downward force. 84N at an angle of 47° = 84 cos 47°= 57.3 N horizontal force forward 84 N sin 47°= 61.4 N…

    • 359 Words
    • 2 Pages
    Satisfactory Essays
  • Satisfactory Essays

    Week 1 Practice Problems

    • 581 Words
    • 3 Pages

    2.A total charge of 2.5 × 10-3 C passes a point every 40 seconds. Calculate the value of the current through the point. I=Q/t =0.0025C/40s= 6.25 C/s = 6.25 A…

    • 581 Words
    • 3 Pages
    Satisfactory Essays
  • Satisfactory Essays

    Practice Quiz

    • 5122 Words
    • 42 Pages

    F = 49 N 5.4 m/s2 80 7. F = 66 N N ◦ 56 8. F = 70 N 9. F = 68 N 10.…

    • 5122 Words
    • 42 Pages
    Satisfactory Essays
  • Satisfactory Essays

    Calculate the kinetic energy gained. Answer in units of J. 002 (part 2 of 2) 10.0 points Through how large a potential difference did the object fall? Answer in units of V. 003 (part 1 of 2) 10.0 points Consider three charges arranged as shown. 7 µC 1.8 µC + + 4 cm −1 µC − 2.4 cm What is the magnitude of the electric field strength at a point 1.7 cm to the left of the middle charge? The value of the Coulomb constant is 8.98755 × 109 N · m2 /C2 .…

    • 984 Words
    • 4 Pages
    Satisfactory Essays
  • Good Essays

    Ap Physics 2002 Answers

    • 1383 Words
    • 6 Pages

    d. Determine the magnitude and direction of the force that must be applied in order to keep the proton at rest.…

    • 1383 Words
    • 6 Pages
    Good Essays
  • Good Essays

    EOQ = sqrt (2*DS/H) = sqrt ((2*5000*100)/(0.28*200) = 133.63 = 134 cases = 134*50 =6700 pounds…

    • 408 Words
    • 2 Pages
    Good Essays
  • Satisfactory Essays

    The excerpt saying "Homes that made Baba's house in Wazir Akbar Khan look like a servant's hut. " is an example of irony because Baba is an educated and rich man in Afghanistan, but in America, he is viewed as an ignorant poor immigrant. The novel’s most prominent example of irony is Amir not stopping Assef from raping Hassan. Amir doesn't stop the rape because he wants Baba's approval; But since he didn't stop Assef, Amir becomes the kind of coward that Baba worried he would become. Amir has always looked to Baba for reassurance and to make sure he has his approval.…

    • 151 Words
    • 1 Page
    Satisfactory Essays
  • Satisfactory Essays

    Electric Charge

    • 1344 Words
    • 6 Pages

    Same idea as 1 but with a different r. We use the Pythagorean theorem to find the new distance which is 9.684 cm. Using the force equation again we get F=-16.45…

    • 1344 Words
    • 6 Pages
    Satisfactory Essays
  • Powerful Essays

    Soccer

    • 5386 Words
    • 22 Pages

    q A point charge q creates an electric field E = ke 2 r ˆ r…

    • 5386 Words
    • 22 Pages
    Powerful Essays
  • Satisfactory Essays

    7.08 N/m7/2. Calculate the force on a surface area of 2 m2 (of a submarine, for example).…

    • 520 Words
    • 5 Pages
    Satisfactory Essays
  • Good Essays

    One is a quarter in a magnitude of the other. In terms of two charges…

    • 14553 Words
    • 59 Pages
    Good Essays