Electric Force and Electric field 1. There are two types of electric charge (positive and negative)
Unit 10: Electric Fields An electric force is a field force. Recall the difference between a field...
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Unit 10: Electric Fields An electric force is a field force. Recall the difference between a field force and a contact force. ◦ Field forces act through space, producing an effect even when there is no physical contact between the objects involved.
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Transcript of Unit 10: Electric Fields An electric force is a field force. Recall the difference between a field...
Unit 10: Electric FieldsAn electric force is a field force.Recall the difference between a field
force and a contact force.◦Field forces act through space, producing an
effect even when there is no physical contact between the objects involved.
Unit 10: Electric FieldsStrength of an electric field and its
effect on q0:
E
Unit 10: Electric FieldsStrength of an electric field (caused by
Q) and its effect on q0:
Unit 10: Electric FieldsElectric field is a vector quantityIt has units of N / CWe consider point charges like q0 in
cases like this because if q0 is too large then it will cause redistribution of charges in Q
Unit 10: Electric FieldsElectric field strength depends on
charge and distance
Unit 10: Electric Fields
Unit 10: Electric Fields
Unit 10: Electric FieldsElectric field is a vectorIf q is positive, the field due to this
charge is directed outward radially from q.
If q is negative, the field is directed toward q.
Unit 10: Electric FieldsExample:
A charge q1 = +7.00 μC is at the origin and a charge q2 = -5.00 μC is on the x-axis 0.300 m from the origin. Find the electric field strength at point P, which is on the y-axis 0.400 m from the origin.(2.71x105 N/C at an angle of 66.6˚)
Unit 10: Electric FieldsElectric field is a vectorIf q is positive, the field due to this
charge is directed outward radially from q.
If q is negative, the field is directed toward q.
Unit 10: Electric FieldsA nice way to visualize electric field
patterns is to use lines in the direction of the field.
Unit 10: Electric FieldsThe number of field
lines is proportional to the electric field strength.
The strength is strongest when the lines are closest together.
Unit 10: Electric FieldsExamples:
Sketch electric field diagrams for two charges of equal magnitude but one is positive and one is negative.
Sketch electric field diagrams for two charges of equal magnitude but both are positive.
Sketch electric field diagrams for two charges of where one charge is 3 times the magnitude of the other and both are negative.
