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Part A For an ideal battery (r 0 S2), closing the switch in (Figure 1) does not affect the brightness of bulb A. In practice, bulb A dims just a little when the switch closes. To see why, assume that the 1.50 V battery has an internal resistance r = 0.70 2 and that the resistance of a glowing bulb is R = 8.00 N. What is the current through bulb A when the switch is open? Express your answer with the appropriate units. • View Available Hint(s) IA, open= Value A Submit Part B What is the current through bulb A after the switch has closed? Express your answer with the appropriate units. • View Available Hint(s) Figure 1 of 1 HA ? IA, closedF Value A Submit A Part C By what percent does the current through A change when the switch is closed? Express your answer as a percentage. • View Available Hint(s)

Part A For an ideal battery (r 0 S2), closing the switch in (Figure 1) does not affect the brightness of bulb A. In practice, bulb A dims just a little when the switch closes. To see why, assume that the 1.50 V battery has an internal resistance r = 0.70 2 and that the resistance of a glowing bulb is R = 8.00 N. What is the current through bulb A when the switch is open? Express your answer with the appropriate units. • View Available Hint(s) IA, open= Value A Submit Part B What is the current through bulb A after the switch has closed? Express your answer with the appropriate units. • View Available Hint(s) Figure 1 of 1 HA ? IA, closedF Value A Submit A Part C By what percent does the current through A change when the switch is closed? Express your answer as a percentage. • View Available Hint(s)

College Physics
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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I need help with parts B & C please.
Part A For an ideal battery (r = 0 2), closing the switch in (Figure 1) does not affect the brightness of bulb A. In practice, bulb A dims just a little when the switch closes. To see why, assume that the 1.50 V battery has an internal resistance r = 0.70 N and that the resistance of a glowing bulb is R = 8.00 N. What is the current through bulb A when the switch is open? Express your answer with the appropriate units. • View Available Hint(s) ? IA, open= Value A Submit Part B What is the current through bulb A after the switch has closed? Express your answer with the appropriate units. • View Available Hint(s) Figure 1 of 1 ? Value A IA, closedF Submit A Part C By what percent does the current through A change when the switch is closed? Express your answer as a percentage. • View Available Hint(s)
Transcribed Image Text:Part A For an ideal battery (r = 0 2), closing the switch in (Figure 1) does not affect the brightness of bulb A. In practice, bulb A dims just a little when the switch closes. To see why, assume that the 1.50 V battery has an internal resistance r = 0.70 N and that the resistance of a glowing bulb is R = 8.00 N. What is the current through bulb A when the switch is open? Express your answer with the appropriate units. • View Available Hint(s) ? IA, open= Value A Submit Part B What is the current through bulb A after the switch has closed? Express your answer with the appropriate units. • View Available Hint(s) Figure 1 of 1 ? Value A IA, closedF Submit A Part C By what percent does the current through A change when the switch is closed? Express your answer as a percentage. • View Available Hint(s)
Expert Solution
Step 1

Part B)

After the switch is closed, the two bulbs are in parallel connection.

The net resistance is

1Rnet = 1R1+1R2

1Rnet = 18+18

1Rnet = 14

Rnet = 4 ohms

This Rnet and the battery's internal resistance are in series.

So, the total resistance is

Rtotal = R1+R2

Rtotal = 4+0.7

Rtotal = 4.7 ohms

Total current through the system i

i = VR

it = 1.54.7

it = 0.32 A

In series connection, the current flow is the same between resistances.

So 0.7 ohms and the Rnet of 4 ohms have the same current.

In resistances connected in parallel, the current splits in the inverse ratio of their resistances.

Here, as both the resistances of the bulbs are the same, the current is split equally.

So, the current in bulb A after switch is closed is

iAc = it2 = 0.322 = 0.16 A

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