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PHS1001 - Foundation physics - S1 2025
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Question 2e)
A storm cloud has -25 nC built up in a 1.0 km diameter spherical charge centre located 10 km above the ground. This charge centre attracts a similar amount of positive charge that is spread on the ground below the ground. The charge centre and ground act as a charged capacitor, with a potential difference of V. In a lightning strike, the large electric field between these two charged regions (acting as electrodes) may ionise the air resulting in a conducting path between the cloud and ground, through which the 'capacitor' discharges.
Give your answer to 0 decimal places in Gigawatt. Write your answer without units i.e., 12 GW as 12.
Question 2 b)
A
storm cloud has -25 nC built up in a 1.0 km diameter spherical charge
centre located 10 km above the ground. This charge centre attracts a
similar amount of positive charge that is spread on the ground below the
ground.
The
charge centre and ground act as a charged capacitor, with a potential
difference of
V. In a lightning strike, the large
electric field between these two charged regions (acting as electrodes)
may ionise the air resulting in a conducting path between the cloud and
ground, through which the 'capacitor' discharges.
A storm cloud has -25 nC built up in a 1.0 km diameter spherical charge centre located 10 km above the ground. This charge centre attracts a similar amount of positive charge that is spread on the ground below the ground. The charge centre and ground act as a charged capacitor, with a potential difference of V. In a lightning strike, the large electric field between these two charged regions (acting as electrodes) may ionise the air resulting in a conducting path between the cloud and ground, through which the 'capacitor' discharges.
Calculate the approximate capacitance of the charge centre + ground system.
Give your answer to 0 decimal places in nF. Write your answer without units i.e., 12 nF as 12.
Question 2d)
A storm cloud has -25 nC built up in a 1.0 km diameter spherical charge centre located 10 km above the ground. This charge centre attracts a similar amount of positive charge that is spread on the ground below the ground. The charge centre and ground act as a charged capacitor, with a potential difference of V. In a lightning strike, the large electric field between these two charged regions (acting as electrodes) may ionise the air resulting in a conducting path between the cloud and ground, through which the 'capacitor' discharges.
If 12.5 C of charge is transferred from the cloud to the ground in a lightning strike, what fraction of the stored energy is dissipated?
Question 2 a)
A storm cloud has -25 nC built up in a 1.0 km diameter spherical charge centre located 10 km above the ground. This charge centre attracts a similar amount of positive charge that is spread on the ground below the ground.The charge centre and ground act as a charged capacitor, with a potential difference of V. In a lightning strike, the large electric field between these two charged regions (acting as electrodes) may ionise the air resulting in a conducting path between the cloud and ground, through which the 'capacitor' discharges.True or False: The lightbulb displays ohmic behaviour.
For the bulb, the plot of V vs I (with voltage on the y axis and current on the x axis) looks like:
For the resistor, the plot of V vs I (with voltage on the y axis and current on the x axis) looks like:
Which of the following statements about the junction rule is correct?
All three capacitors in the diagram below have equal capacitance (C). What is the equivalent capacitance Ceq ?