Electrostatics

Two electrons experience a force of \(3.46 \times 10^{6}\) N. What is the distance between them?

The voltage across a 50 μF capacitor rises at a constant rate of 10 V/ms. Calculate the current through the capacitor.

Two capacitors \(C_1\) = 100 μF and \(C_2\) = 50 μF are placed in series. Find the maximum energy stored when a 220 V dc supply is applied across the combination.

Two electrons in a vacuum experience a force of \(2 \times 10^{-15}\) N. How far apart are the electrons?

Two capacitors of 0.1 μF, 250 V and 0.2 μF, 500 V are connected in series. What is the maximum voltage that can be applied across the combination?

Calculate the capacitance of a parallel plate capacitor having 20cm x 20cm square plates separated by a distance of 1mm. Assume the dielectric medium to be air.

A 40 μF capacitor is supplied with a voltage of \(v(t) = 100\sin 377t\). Find the current equation.

A capacitor is charged 0.23 watt-second of energy at a voltage of 48 volts. What is its capacitance?

What is the capacitance of a parallel-plate capacitor having rectangular plates 10 cm by 20 cm separated by a distance of 0.1 mm? the dielectric is air.

What is the relative permittivity of vacuum?

Three capacitance of 4μF, 6 μF, and 5 μF are connected in series across a 110-volt dc source. Find the charge passing through each capacitor.

A capacitor consists of two metal plates each plates 40 cm x 40 cm, spaced 6 mm apart. The space between the metal plates is filled with a glass plate 5mm thick and layer of paper 1mm thick. The relative permittivities of glass and paper are 8 and 2, respectively. Calculate the capacitance.

Two charges of \(2 \times 10^{-5}\) C and \(3 \times 10^{-6}\) C are placed 10 cm apart. Find the force in kg on each charge.

The charge on the plates of a 1μF capacitor is 50 μC. What is the energy stored by the capacitor?

A hollow sphere is charged to 12 μC of electricity. Find the potential inside the sphere. The radius of the sphere is 0.1m.

Three capacitors are connected in series across a 135 V supply. The voltages across them are 30, 45 and 60 V and the charge on each is 4,500 μC. Find the total capacitance in microfarads.

The unit of elastance is

Two capacitors C1= 50uF and C2= 30uF are connected in series. Find the equivalent capacitance in uF.

Three capacitances C1= 6uF, C2= 7uF and C3= 18uF are connected in series across a 120v supply. Find the voltages across C3.

Calculate the capacitance of a parallel plate capacitor having 20 cm x 20 cm square plates separated by a distance of 1 mm. Assume the dielectric medium to be air with permittivity of \(8.85 \times 10^{-12}\) F/m.