Comparing Fields

We have seen that the characteristics of gravitational and electric fields have some similarities and differences.

	*Gravitational Fields*	*Electric Fields*
Force is between	Masses	Charges
Constant of proportionality
Equation for force	Newton (N)	Newtons (N)
Nature of force	Attractive only	Like charges repel
Definition of field strength	Force per unit mass	Force per unit charge
Field strength in radial field	Newtons per kilogram (N/kg)	Newtons per Coulomb (N/C)
Definition of potential	The work done in bringing a unit mass from infinity to the point in the field	The work done in bringing a unit charge from infinity to the point in the field
Potential	Joules per kilogram (J/kg)	Joules per Coulomb (J/C)
Potential at infinity	0	0
Work done moving between points of different potential	Joules (J)	Joules (J)
Gradient of potential against distance graph	Field strength	Field strength

Section 7	Capacitors
Lesson 7
Learning Outcomes	To be able to calculate capacitance
	To be able to explain what happens as a capacitor charges up
	To be able to derive the energy stored by a capacitor	M.BENYOHAI

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