Compare the current at A now to the current at A with only one bulb. A. The curr

Question

Compare the current at A now to the current at A with only one bulb. A. The current at A is now twice as large as before. B. The current at A is now larger than before but not twice as large. C. The current at A is the same as before. D. The current at A is now half as large as before. E. The current at A is now smaller than before but not half as large. Compare the potential difference across the bulb, V_BC, now to what it was before when there was only one bulb. A. The potential difference is now twice as large as before. B. The potential difference is now larger than before but not twice as large. C. The potential difference is the same as before. D. The potential difference is now half as large as before. E. The potential difference is now smaller than before but not half as large. Compare the brightness of the bulb connected between B and C to its brightness before when there was only one bulb. A. The bulb is brighter than it was before. B. The bulb is just as bright as before. C. The bulb is dimmer than it was before.

Explanation / Answer

11.

Answer is D

Current through two bulbs

I1=V/(R+R)=(1/2)(V/R)

currrent through one bulb

I2=(V/R)

=>I1/I2=(1/2)*(V/R)/(V/R)=1/2

12.

Answer is D

with 2 bulbs

VBC,1=IR=(1/2)(V/R)*R=(1/2)V

with one bulb

VBC,2=(V/R)*R=V

13.

Answer is A

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