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3. For an ideal battery (r- 02), closing the switch in the following figure does not affect the brightness of bulb A. In reality, when a real battery with an non zero internal resistance is used, bulb A dims just a little when the switch closes. To see why, assume that the 1.5V battery has an internal resistance r = 0.5 Ω and that the resistance of a glowing bulb is R- 6S 1.5v÷ : lamp A amp B (a) What is the current through bulb A when the switch is open? (b) What is the current through bulb A after the switch has closed? (c) By what percent does the current through A change when the switch is closed? (d) Explain why the current through A does not change when the switch is closed if page 2 of 5
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total Resistane YtRA(05+6) fom ohms law 6.5 Total vesistona voilu be, 6 x 6 0 3 X100 6.95695 a Suirh opning t lusing doshor s veny ralilgabie 15

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