Coulomb's law, electric field and potential, capacitors, dielectrics.
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Q1 · Electrostatics · MEDIUM
Two point charges 2 μC and 3 μC are 6 cm apart in vacuum. The force between them (k = 9 × 10⁹ N·m²/C²) is:
Q2 · Electrostatics · EASY
Energy stored in a 10 μF capacitor at 200 V is:
Q3 · Electrostatics · MEDIUM
Electric field at a distance of 10 cm from a 1 μC point charge in vacuum (k = 9 × 10⁹) is:
Q4 · Electrostatics · EASY
If the separation between the plates of a parallel plate capacitor is doubled while area remains the same, capacitance becomes:
Q5 · Electrostatics · MEDIUM
A parallel plate capacitor of capacitance 5 μF is charged to a potential difference of 100 V. It is then disconnected from the battery and connected to another uncharged capacitor of capacitance 10 μF. What is the common potential across both capacitors?