# Q4S - a On the diagram sketch the circular path followed by...

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Quiz 4 Solutions Check the best answer. 1. Two light bulbs consume 60 W each when connected across a 120 V source. If they are connected in series across that source, each one consumes: 15 W. [Now ½ the potential across each, so ¼ the power.] 30 W. 60 W. 120 W. Check T or F depending on whether the statement is true or false. 2. At t = 5 τ (where is the time constant RC ) a capacitor being charged has voltage within e 5 0.007 of its Fnal value. T ± Physics 54 Summer 2011 1

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3. A proton (mass m , charge + e ) is moving at the instant shown with velocity v perpendicular to a uniform B-Feld.
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Unformatted text preview: a. On the diagram, sketch the circular path followed by the proton, indicating whether it moves clockwise or counter-clockwise. b. What is the radius of the path? c. The orbiting charge constitutes a current loop. What is the direction of its magnetic moment? a. See drawing. At the instant shown the force is to the right, so the proton runs in a counter-clockwise circle. b. We have from the 2nd law: qvB = mv 2 / r , so r = mv / qB . c. Out of the page (opposite to B ). ⊗ v B Physics 54 Summer 2011 2...
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Q4S - a On the diagram sketch the circular path followed by...

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