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chapter15.4-15.6_lecture

# chapter15.4-15.6_lecture - The electrical force between...

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` The electrical force between charges can be better understood by introducing the concept of electrical field ` Just like masses produce gravitational field, charges produce electric field (vector, denoted as ) around it ` When another charge q 0 (sometimes referred to as a test charge ) enters this electric field, the field exerts a force on the ` Therefore, although not visible, the electrical field can be “feel” by charges E q F G G 0 = E G (SI units: N/C) ` Positive test charge : the force is along the same direction as the electrical field ` Negative test charge : force and electrical field are in opposite directions ` Demo (Ping-pong ball in parallel plates) E q F G G 0 = +q E F G G , -q E G F G

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Result of Reading Assignment Quiz ` Direction of the electrical field: ` Magnitude of the electrical field (SI units: N/C) ` The Superposition Principle can be applied to the electric field if a group of charges is present 2 | | | | r q k E e = G E q F G G 0 =
2 2 9 2 /C m N 10 9 | | | | × = e e k r q k E G C 10 8 6 1 × + = q C 10 5 6 2 × = q 2 1 1 1 | | | | r q k E e = G 0 1 = x E 2 6 9 ) 4 . 0 ( 10 8 10 9 × × × = N/C 10 5 . 4 5 × = N/C 10 5 . 4 5 1 × = y E 2 2 9 2 /C m N 10 9 | | | | × = e e k r q k

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chapter15.4-15.6_lecture - The electrical force between...

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