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P.1 Rubbing Electric charges P.1 Matter Atom Proton + + Neutron Electron - - P.1.

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Presentation on theme: "P.1 Rubbing Electric charges P.1 Matter Atom Proton + + Neutron Electron - - P.1."— Presentation transcript:

1

2 P.1

3 Rubbing Electric charges P.1

4 Matter Atom Proton + + Neutron Electron - - P.1

5 Hydrogen Electrically neutral P.1

6

7 Only electron can be added or removed No. of electrons = no. of protons Electrically neutral P.1

8 Positive charge - - P.1

9 Negative charge P.1

10

11

12 Like charges repel P.1

13 Unlike charges attract P.1

14 Charged object attracts uncharged object P.1

15 Test P.1

16 Kinetic energy of electrons Rubbing P.2

17 Positive charges are formed because of loss of electron Negative charges are formed because of gain of electron Principle of conservation of charge - - P.2

18 Unit of charge Charge of an electron = - 1.6x C No. of electrons in 1 C = 6.25 x Coulomb (C) P.2 Smallest charge = - 1.6x C

19 Conductor Insulator Conduct electricity & heat energy Free electrons P.2

20 Charges repel each other Resultant force = 0 Charges are rest on the surface P.3 Charge distribution

21 Higher charges density at sharp edge P.3 Charge distribution

22 Positive charges are formed because of loss of electron Negative charges are formed because of gain of electron Kinetic energy of electrons Rubbing - - P.3

23 Resistor - - P.3

24 5 kV

25 EHT e-e- P.3

26 EHT e-e- P.3

27 Electrons are repelled Sphere is neutral Positive & negative charges are formed Charge sharing P.5

28 Electrons are repelled & flow to the sphere e-e P.5

29 Negative charges are shared between the rod & the sphere ---- P.5

30 ---- Charge sharing produces same kind of charge Amount of charge decreases after sharing P.5

31 Electrons are attracted Sphere is neutral Positive & negative charges are formed P.5

32 Electrons are attracted & flow to the rod e-e- P.5

33 Positive charges are shared between the rod & the sphere ++++ P.5

34 ++++ Charge sharing produces same kind of charge Amount of charge decreases after sharing P.5

35 Charges are attracted each other P.5 (e.g.) -4 x C +9 x C

36 Positive Charges are repelled P.5 (e.g.) Total charges = +5x C

37 P.5 (e.g.) Charges in each ball = +2.5x C

38 Electrons are repelled Sphere is neutral Positive & negative charges are formed Charge induction P.4

39 e-e- e-e- Positive charges are attracted by the negative charges of the rod Negative charges are shared between the sphere & the earth Earthing P.4

40 Charges are shared by the ball & the Earth P.4 Bigger in size will have more charges Nearly all charges in ball will be gone Earthing

41 The surface area of the earth is much larger Nearly all the negative charges are lost P.4

42 Charge induction produces opposite sign of charge Amount of charge remains the same P.4

43 Electrons are attracted Positive & negative charges are formed Sphere is neutral P.4

44 e-e- e-e Negative charges are attracted by the positive charges of the rod Positive charges are shared between the sphere & the earth Earthing P.4

45 The surface area of the earth is much larger Nearly all the positive charges are lost P.4

46 Charge induction produces opposite sign of charge Amount of charge remains the same P.4

47 No charge Electrons are repelled Positive & negative charges are formed P.4

48 The spheres must be separated under the presence of the charged rod P.4

49 Both kinds of charges are produced P.4

50

51

52 Charged sphere attracts neutral ball P.4

53

54

55 Charge sharing & the ball is repelled Charges are neutralized & the ball becomes uncharged P.4

56 Hairs are charged by sharing Hairs repel each other since they have the same charge P.4

57 Initially, hairs are neutral P.4

58 Initially, hairs are negatively charged P

59 Charges repel each other P

60

61 Neutral smoke grains are attracted by the charged conductor P.4

62 Light bulb lights up Current flows P.4

63 Small current flows Light-beam galvanometer P.4

64 Sparks P.4

65 Light up bunsen burner P.4

66 Electric wind + - P.4

67

68

69 +

70 P.6 (2002) Water is neutral. Attracted by charged ruler Action and Reaction Pair.

71 P.6 (2001) Can be negative charges because LIKE charges repel X Action and Reaction Pair. X Same F, but different masses. Larger Mass, less displacement

72 P.7 (0427) 3 +ve charges. Repel each other 3 -ve charges. Repel each other 2 +ve charges and 1 –ve charge. Not for any 2 of them X

73 P.7 (0427) A (+ve) attracts B (neutral) A (+ve) attracts C (neutral) B (neutral) CANNOT attract C (neutral) X X

74 P.7 (0427) A (+ve) repels B (+ve charge) A (+ve) attracts C (neutral) B (+ve charge) attracts C (neutral) X X X

75 P.7 (0427) A (+ve) attracts B (-ve charge) A (+ve) attracts C (neutral) B (-ve charge) attracts C (neutral) X X X

76 P.7 (0029)

77 P.7 (9829) + -

78 P.7 (9727)

79 P.7

80 Electric force P.

81 Attractive electric force P.

82 P.7

83 Conductor Attractive force Equal amount of positive & negative charges are induced Attractive force is greater than the repulsive force because of shorter distance Repulsive force Repulsive force P.7

84 Insulator Equal amount of positive & negative charges are induced in each molecule Attractive force is greater than the repulsive force because of shorter distance Attractive force Repulsive force P.7

85 Electroscope Test of charges P.7

86 Opposite signs of charges are induced Gold leaf diverges because of repulsive force P.7

87 P.8 (9629) Repel each other X Attract each other Can attract neutral object

88 P.8 (0344) Can attract neutral object True Net negative charge =0 False

89 Discharge through air + - P

90 Discharge through air + - P The charged rod will be less negative.

91 Field Gravitational field m Weight mg Electric field Force acts on an object with some special property +- P.8

92 Shark detects other fish by the change of electric field in their bodies P.8

93 Direction of electric field lines Direction of electric force acting on a negative charge is in opposite direction Direction of electric force acting on a positive charge P.9

94 + - -

95 F=0 Neutral point Direction of resultant force Direction of electric field line P.9

96 +-

97 The electric field line must be perpendicular to the metal plate otherwise the charge will move P.9

98 The electric field is uniform between 2 parallel metal surface The charges appear on the inner surface P.9

99 Field line starts from positive charge Field line end at negative charge + - P.9

100 Field lines have NO branches or cross each other Resultant force point in one direction only P.9

101 NO field line exist inside metal P.9

102

103

104 E

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106 Electric field strength Electric force acting on +1C charge + - P.9

107 P.10 e.g. W=mg = 2 x (10) = 2 x (N) W FeFe F e =W= 2 x (N) + + Q=F e / E =2 x / 1.25 x10 4 =+1.6 x (C)

108 Draw the electric field pattern P

109 Draw the electric field pattern P.10

110 P.10 (0331) + Cancel each other

111 P.10 (0331) - Cancel each other

112 Applications of Electrostatics P.10

113 P.11

114

115

116 P.12

117 Positively charged drum Neutralized positive charges Carbon powder sticks on positive charges Carbon powder sticks on positively charged paper Infra-red neutralize all the charges

118 EE P.12

119 I want to paint my new house !!! I want to paint my new house !!! P.12

120

121 Rub / charge the wall Electrostatic spray Electrostatic spray P.12 Less paint required Sticks strongly

122 Electrostatics Hazards P.13

123 Sparkles

124 P.13

125 Dust Problem ??? P.13

126 Static charges damage microphone P.13

127 Anti-static pad P.13

128 Anti-static tyres P.13

129

130

131

132

133 to neutralize the charges in clouds to lead the charges from lightning to the ground

134 P.14 True False

135 P.14

136 Electrons are attracted Positive & negative charges are formed P.14

137 Electrons are attracted & flow to the rod e-e- P.14

138

139 Both of them are positively charged P.14 Charge sharing produces same kind of charge

140 P.14

141 No charge Electrons are repelled Positive & negative charges are formed P.14 Charging by Induction

142 The spheres must be separated under the presence of the charged rod P.14

143 Both kinds of charges are produced P.14

144

145 P

146 P

147 P.15

148 The electric field is uniform between 2 parallel metal surface The charges appear on the inner surface P.15

149

150 A B - Ball is negatively chargedBall is attracted to LHS

151 P.15 A B -

152 A B - Charge sharing. Ball is +ve. + Ball is attracted to RHS

153 P.15 A B +

154 A B Ball is negatively chargedBall is attracted to LHS +-

155 P.15 W=mg = 9.1 x (10) = 9.1 x (N) W FeFe F e =eE=(1.6 x ) (6 x10 4 ) (N) - F net =F e - W = 9.6 x (N) If d=10 cm =0.1 m =9.6 x (N) a=1.055 x10 16 (m/s 2 ) v 2 = a d v = 45.9 x 10 6 (m/s)


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