# review - Re w vie Example 1 Mass m =1.0 gramand chargeq in...

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Review

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Example 1 Mass m=1.0 gram and charge q in a uniform electric field E=100N/C on a string of length L= 50 cm. Determine q. L ° 30 m q (equilibrium)
Example 2 Two charges of equal magnitude and oppositesign separated by a distance2a, are placed on thex axis at ( - a, 0) and (+a, 0). a) Calculate the electric potential at point P, at (a, a). b) Calculate the electric field at point P. -q P +q a a a x y

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Example 3 Theelectric field at theends of a cylinder perpendicular to a sheet has a strength of 100N/C. What is thecharge density of the sheet ?
Example 4 A 5-C chargemoves with a velocity of v =(2i+4j-k) m/s in an magnetic field of B =(1i+2j-3k). What if theforceon thecharge?

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Example 5 A parallel-plate capacitor has plates of 2cmx3cm in dimension. Theplates are separated by a 1mm thickness of paper (k=3.7). A) What is the capacitance of this capacitor? B) How does thecapacitancechangewhen thedistance between the plates increases by three?
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