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ch30 - Review of Quiz4 Difficult Questions Two 10.0 cm...

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Review of Quiz4 Difficult Questions
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2 Two 10.0 cm diameter charged rings face each other, 20.0 cm apart. Both rings are charged to +20.0 nC. What is the magnitude of the electric field strength at the centre of the left ring? Hint: In general, the electric field due to a charged ring at a point on the axis is: E = kzQ/(z 2 + R 2 ) 3/2
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3 A sphere of radius R has a charge Q. The electric field strength at a distance r > R is E i . What is the ratio E f /E i of the final to initial electric field strength if R is halved?
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4 A flat disk 1.0 m in diameter is oriented so that the plane of the disk makes an angle of ! /6 radians with a uniform electric field. If the field strength is 491.0 N/C, find the electric flux through the surface.
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5 What is the electric field strength if the flux through a 2.0 m by 1.0 m rectangular surface is 836.0 Nm 2 /C, if the electric field is uniform, and if the plane of the surface is at an angle of ! /3 radians with respect to the direction of the field?
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Electric Potential and Electric Field
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7 Physical Example
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8 Physical Example Solar cells - like batteries “generate” electricity What does this mean? What does a battery really do? To answer these questions we need to understand the connection between electric potential and electric field This is what we will learn over the next two lectures
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