This is a problem on electric current

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SUMMARY

The discussion focuses on calculating the time required for an isolated conducting sphere with a radius of 10 cm to increase its potential by 1200 V, given an inward current of 1.0000020 A and an outward current of 1.0000000 A. The net inward current is determined to be 0.0000020 A. Using the formula for electric potential, V_R = q / (4 π ε₀ R²), the charge stored in the sphere can be calculated, leading to the determination of the time required for the current to transfer this charge.

PREREQUISITES
  • Understanding of electric potential and current flow
  • Familiarity with the formula for electric potential in a conducting sphere
  • Basic knowledge of charge transfer and current equations
  • Concept of capacitance in isolated conductors
NEXT STEPS
  • Study the relationship between current, charge, and time using the equation dq/dt
  • Learn about the derivation and application of the electric potential formula for spheres
  • Explore the concept of capacitance for isolated conductors and its implications
  • Investigate the effects of different current magnitudes on potential change in conductors
USEFUL FOR

This discussion is beneficial for physics students, electrical engineering students, and anyone interested in understanding electric potential and current dynamics in isolated conductors.

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Homework Statement



An isolated conducting sphere has a 10 cm radius. One wire carries a current of 1.000 002 0 A into it. Another wire carries a current of 1.000 000 0 A out of it. How long would it take for the sphere to increase in potential by 1200 V?

Homework Equations



n/a

The Attempt at a Solution


tried using i= dq/dt
 
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You'll need to rearrange the following equation to find how much charge, [itex]q[/itex], the sphere will store when its surface potential is at 1,200 V.

[tex]V_R=\frac{q}{4 \pi \epsilon_0 R^2}[/tex]

You know the magnitudes of the inward- and outward-flowing currents, therefore you can calculate the net inward-flowing current. All you need to do next is work out how long it takes for this current to transfer charge [itex]q[/itex].
 

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