# HW4 - yang(ey942 – oldhomework 04 – Turner –(56705 1...

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Unformatted text preview: yang (ey942) – oldhomework 04 – Turner – (56705) 1 This print-out should have 8 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 (part 1 of 2) 10.0 points The figure below shows the electric field lines for two point charges separated by a small distance. q 1 q 2 What are the signs of q 1 and q 2 ? 1. q 1 > 0 and q 2 > 2. q 1 > 0 and q 2 < correct 3. q 1 < 0 and q 2 > 4. q 1 < 0 and q 2 < Explanation: Field lines are directed toward negative charges, so q 1 > 0 and q 2 < 0. 002 (part 2 of 2) 10.0 points The ratio R = q 1 q 2 satisfies 1. < R < 1 2. − 1 < R < correct 3. R < − 1 4. R > 1 Explanation: A stronger field is depicted by field lines of higher density, so the magnitude of q 2 is greater than the magnitude of q 1 , and | q 2 | > | q 1 | 1 > | q 1 | | q 2 | > Since q 1 < 0 and q 2 > 0, − 1 < − | q 1 | | q 2 | < − 1 < q 1 q 2 < . 003 (part 1 of 4) 10.0 points A good model for a radio antenna is a dipole. In the figure below P 1 is on the perpendic- ular bisector of the dipole, and P 2 is along the axis of the dipole in the direction of the dipole vector ˆ p . P 1 and P 2 are both a distance 100 m from the center of the dipole. The magnitude of each of the charges is 4 . 9 μ C . + − 1 . 2 m vectorp P 2 ( − 100 m , 0) P 1 (0 , 100 m) What is the magnitude of the electric field at P 1 ?...
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HW4 - yang(ey942 – oldhomework 04 – Turner –(56705 1...

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