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16. Conservation of Mass, Conservation of Linear Momentum, Conser-

19. Moment of a System of Particles Acted upon by Several Forces

20. Work and Energy.

18

19

28. Magnetic Charge. A Magnetic Pole as a Force-Producing Agent.

29. Induced Magnetisation .

28

Art.

Page

34. Force Required to Separate Two Equal and Opposite Poles

35. The Earth's Magnetic Field

36. Magnetic Moment. Equivalent Length of a Magnet .

37. Equality of the Poles of a Magnet. Equilibrium Position of a Magnet

in a Uniform Field .

38. Measurement of the Horizontal Component of the Intensity of a Mag-

netic Field

40

39. Flux of Force Due to a Single Pole. Lines of Magnetic Force Due

to a Single Pole

40. Gauss's Theorem

41. Lines of Force Representing the Resultant Field Due to any Number

of Magnets

42. Intensity of Magnetisation

43. Lines of Induction. Flux of Magnetic Induction

45. The Normal Components of the Flux Density on the Two Sides of

any Surface are Equal

61

46. The Tangential Components of the Field Intensity on the Two Sides

of any Surface are Equal

62

47. Conditions which must be Satisfied at Every Surface in a Magnetic

Field

48. Induced Magnetisation.

49. Magnetic Permeability

50. Refraction of the Lines of Induction at the Surface of Separation of

Two Bodies of Different Permeabilities

66

51. Value of the Pole Strength per Unit Area Induced on the Surface of

Separation of two Bodies of Different Permeabilities

67

52. Field Intensity at any Point in a Magnetic Medium of Constant Per-

meability Completely Surrounding a Point-Pole and Filling all

58. The Electric Current

59.

Conductors and Insulators or Dielectrics

60. Electricity Analogous to an Incompressible Substance Filling all

61.

62.

Space

A Wire as a Geometrical Line

Definition of the Strength of an Electric Current. Definition of a

Continuous Current

63. Definition of the Direction of an Electric Current

64. Conductors in Series and in Parallel. Continuity of an Electric

Current

65. Total Force Produced by a Magnetic Field on a Wire Carrying an

Electric Current

66. Force Produced by a Uniform Magnetic Field on a Straight Wire

Carrying an Electric Current

67. Magnetic Field Produced by an Electric Current in a Wire

68. Direction of the Lines of Force Produced by an Electric Current

69. Magnetic Field Due to a Current in a Long Straight Wire

70. Magnetic Field Due to a Current in a Circular Coil of Wire

71. Absolute Measurement of an Electric Current

91

.

92

93

95

96

101

103

72. Comparison of the Strengths of Electric Currents. Galvanometers

and Ammeters

105

87.

86. Electric Energy and Electric Power. The Wattmeter

Electromotive Force

127

129

95. Electromotive Force Due to Change in the Number of Lines of

Induction Linking a Circuit

145

96. Work Required to Change the Number of Lines of Induction Link-

ing an Electric Circuit.

140

97. Electromotive Force Induced by the Cutting of Lines of Induction

98. Intensity of the Magnetic Field Inside a Long Solenoid

147

158

99. Experimental Determination of the Lines of Induction Linking an

105.

104. Work Required to Establish an Electric Current

Coefficient of Self-Induction or Inductance

169

173

106.

Analogy between the Magnetic Energy of an Electric Current and

the Kinetic Energy of a Moving Column of Water

107. The Inductance of Two Long Parallel Wires .

176

177

108. Total Work Required to Establish Currents in Two Independent

Circuits near Each Other. Mutual Inductance

179

109. Total Energy of the Magnetic Field Due to any Number of Electric

Currents

181

110. Heat Energy Due to Hysteresis

183

111. Summary of the Expressions for the Energy of the Magnetic Field

Produced by Electric Currents

184

CHAPTER V

ELECTROSTATICS

112. Electric Charges

186

113. Positive and Negative Charges. Attraction and Repulsion of

Charged Bodies

114. Charging by Contact and by Induction

116. Properties of Electric Charges

187

188

191

117.

Electrostatic Field of Force. Electrostatic Intensity

193

118. Lines of Electrostatic Force. Flux of Electrostatic Force.

119. Lines of Electrisation .

194

121.

120. Lines of Electrostatic Induction. Flux of Electrostatic Induction

Dielectric Constant

195

196

122.

A Closed Hollow Conductor an Electrostatic Screen

123. The Electrostatic Intensity Within the Substance of a Conductor in

which there is no Electric Current is Always Zero

124. The Total Charge Within any Region Completely Enclosed by a Con-

ductor is Always Zero

125. The Electrostatic Intensity just Outside a Charged Conductor is

Normal to the Surface of the Conductor

199

126. The Electrostatic Flux Density just Outside a Charged Conductor is

Independent of the Nature of the Surrounding Dielectric

200

127. Conditions which Must be Satisfied at any Surface in an Electro-

static Field .

132. Relation between Electrostatic Charge and Quantity of Electricity 207

133. Relation between Electrostatic Potential and Electric Potential

210

211

213

214

145. Establishment of a Steady Current in a Circuit Containing Resistance

and Inductance.

226

146. Decay of Current in a Circuit Containing Resistance and Inductance 229

147. Charging a Condenser through a Resistance

148. Discharge of a Condenser through a Resistance

149. Discharge of a Condenser through an Inductance

230

232

233

153. Period, Frequency, Alternations, Periodicity and Phase

243

159. Average Power of a Harmonic P. D. and a Harmonic Current.

Power Factor

250

160. Power of a Non-Harmonic P. D. and a Non-Harmonic Current

253

161.

Effective Value of a Non-Harmonic Current or P. D.

254

162. Equivalent Harmonic Current and P. D.

Determination of the Maximum Value and Phase of the Harmonics

in a Wave of any Shape

165. Power and Reactive Components of P. D. and Current

255

258