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ASHA 777 [7]
4 years ago
8

The resistance of a copper wire increases if it is heated and decreases if it is cooled. What will happen to a circuit made of c

opper wire if the temperature drops from 40°C to 20°C?
A.The current, voltage, and resistance will all increase.
B.The voltage and the resistance will remain constant.
C.The current will increase and the resistance will decrease.
D.The resistance will increase and the voltage will remain constant.
Physics
2 answers:
OlgaM077 [116]4 years ago
6 0
I'd say the answer was C. Wire cools, so resistance decreases. Low resistance mean higher current. One possibly spectacular example of this is SUPERCONDUCTIVITY, much used in persistent current carrying coils in hospital imaging equipment, I think.
aliya0001 [1]4 years ago
3 0
D the resistance will increase. And it will cause current to decrease
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The potential across the capacitor at t = 1.0 seconds, 5.0 seconds, 20.0 seconds respectively is mathematically given as

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  • t=1.967v
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<h3>What is the potential across the capacitor?</h3>

Question Parameters:

A 1. 0 μf capacitor is being charged by a 9. 0 v battery through a 10 mω resistor.

at

  • t = 1.0 seconds
  • 5.0 seconds
  • 20.0 seconds.

Generally, the equation for the Voltage is mathematically given as

v(t)=Vmax=(i-e^{-t/t})

Therefore

For t=1

V=5(i-e^{-1/10})

t=0.476v

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t=1.967

For t=20s

V2=5(i-e^{-20/10})

V2=4.323v

Therefore, the values of voltages at the various times are

  • t=0.476v
  • t=1.967v
  • V2=4.323v

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Complete Question

A 1.0 μF capacitor is being charged by a 5.0 V battery through a 10 MΩ resistor.

Determine the potential across the capacitor when t = 1.0 seconds, 5.0 seconds, 20.0 seconds.

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A torsional pendulum consists of a disk of mass 450 g and radius 3.5 cm, hanging from a wire. If the disk is given an initial an
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In the equlibrium we have to t=0, \theta(t) = \theta_0 and in the given position we have to

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Derived the expression we will have the equivalent to angular velocity

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Replacing,

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