numericfields7-18

# numericfields7-18 - TYPICAL NUMERIC QUESTIONS FOR PHYSICS I...

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TYPICAL NUMERIC QUESTIONS FOR PHYSICS I REGULAR QUESTIONS TAKEN FROM CUTNELL AND JOHNSON ELECTRIC FIELDS AND POTENTIAL (3) Science concepts. The student knows forces in nature. The student is expected to (C) Identify and analyze the influences of charge and distance on electric forces 1. A charge Q exerts a 12 N force on another charge q . If the distance between the charges is doubled, what is the magnitude of the force exerted on Q by q ? A) 3 N B) 6 N C) 24 N D) 36 N E) 48 N 2. At what separation will two charges, each of magnitude 6 μ C, exert a force of 1.4 N on each other? A) 5.1 × 10 6 m B) 0.23 m C) 0.48 m D) 2.0 m E) 40 m 3. A 4.0-μC charge is located 0.30 m to the left of a +6.0-μC charge. What is the magnitude and direction of the electrostatic force on the positive charge? A) 2.4 N, to the right D) 4.8 N, to the left B) 2.4 N, to the left E) 7.2 N, to the right C) 4.8 N, to the right 4. What is the magnitude of the electric field due to a 4.0 × 10 9 C charge at a point 0.020 m away?

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## This note was uploaded on 03/14/2011 for the course PHYSICS 105 taught by Professor Kruse,m during the Spring '08 term at Duke.

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numericfields7-18 - TYPICAL NUMERIC QUESTIONS FOR PHYSICS I...

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