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253-hwk-23a

# 253-hwk-23a - HPHY 253 Homework 23a Electric Fields...

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HPHY 253 Homework 23a Electric Fields: Distributions of Point Charges Dr. A. E. Bak Name 1. Serway & Jewett Problem 23 : 3 . Nobel laureate Richard Feynman (1918-1988) once said that if two persons stood at arm°s length from each other and each person had 1% more electrons than protons, then the force of repulsion between them would be enough to lift a ±weight°equal to that of the entire Earth. Carry out an order-of-magnitude calculation to substantiate this assertion. 2. Serway & Jewett Question 23 : 7 . A charged particle is at the origin of coordinates. The particle produces an electric ²eld of 4 e x kN= C at the point with position vector 36 e x cm . i. At which position does the ²eld have the value 1 e x kN= C ? ( a ) 9 e x cm ; ( b ) 18 e x cm ; ( c ) 72 e x cm ; ( d ) 144 e x cm ; ( e ) nowhere : Choose from these possibilities. ii. At which position does the ²eld have the value 16 e x kN= C ? Choose from the possibilities presented in part i . 3. Serway & Jewett Problem 23 : 12 . In Figure P 23 : 12 , determine the point (other than in²nity) at which the electric ²eld is zero.
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