EBK PHYSICS FOR SCIENTISTS AND ENGINEER
EBK PHYSICS FOR SCIENTISTS AND ENGINEER
16th Edition
ISBN: 8220100546716
Author: Katz
Publisher: CENGAGE L
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Chapter 25, Problem 70PQ
To determine

The electric flux through each of the six faces.

Expert Solution & Answer
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Answer to Problem 70PQ

The electric flux through each of the six faces are 3.2×102Nm2/C_, 0_, 0_, 4.0×102Nm2/C_, 0_ and 2.4×102Nm2/C_.

Explanation of Solution

The following figure marks the faces of the cube with coordinate axes.

EBK PHYSICS FOR SCIENTISTS AND ENGINEER, Chapter 25, Problem 70PQ

Write the expression to find the electric flux.

    ΦE=EdA                                                                                                   (I)

Write the expression for the area vector for the first face of the cube.

    dA1=dydzi^

Substitute dydzi^ for dA and (4.0N/Cm)xi^+(5.0N/Cm)yj^+(3.0N/Cm)zk^ for E in equation (I).

    ΦE,1=((4.0N/Cm)xi^+(5.0N/Cm)yj^+(3.0N/Cm)zk^)dydzi^=3.2×102Nm2/C

Write the expression for the area vector for the second face of the cube.

    dA2=dxdzj^

Substitute dxdzj^ for dA and (4.0N/Cm)xi^+(5.0N/Cm)yj^+(3.0N/Cm)zk^ for E in equation (I).

    ΦE,2=((4.0N/Cm)xi^+(5.0N/Cm)yj^+(3.0N/Cm)zk^)dxdzj^=0

Write the expression for the area vector for the third face of the cube.

    dA3=dydzi^

Substitute dydzi^ for dA and (4.0N/Cm)xi^+(5.0N/Cm)yj^+(3.0N/Cm)zk^ for E in equation (I).

    ΦE,3=((4.0N/Cm)xi^+(5.0N/Cm)yj^+(3.0N/Cm)zk^)dydzi^=0

Write the expression for the area vector for the fourth face of the cube.

    dA4=dxdzj^

Substitute dxdzj^ for dA and (4.0N/Cm)xi^+(5.0N/Cm)yj^+(3.0N/Cm)zk^ for E in equation (I).

    ΦE,4=((4.0N/Cm)xi^+(5.0N/Cm)yj^+(3.0N/Cm)zk^)dxdzj^=4.0×102Nm2/C

Write the expression for the area vector for the fifth face of the cube.

    dA5=dxdyk^

Substitute dxdyk^ for dA and (4.0N/Cm)xi^+(5.0N/Cm)yj^+(3.0N/Cm)zk^ for E in equation (I).

    ΦE,5=((4.0N/Cm)xi^+(5.0N/Cm)yj^+(3.0N/Cm)zk^)dxdyk^=0

Write the expression for the area vector for the first face of the cube.

    dA6=dxdyk^

Substitute dxdyk^ for dA and (4.0N/Cm)xi^+(5.0N/Cm)yj^+(3.0N/Cm)zk^ for E in equation (I).

    ΦE,6=((4.0N/Cm)xi^+(5.0N/Cm)yj^+(3.0N/Cm)zk^)dxdyk^=2.4×102Nm2/C

Conclusion:

Therefore, the electric flux through each of the six faces are 3.2×102Nm2/C_, 0_, 0_, 4.0×102Nm2/C_, 0_ and 2.4×102Nm2/C_.

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Chapter 25 Solutions

EBK PHYSICS FOR SCIENTISTS AND ENGINEER

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