Electric Circuits Answers

Three capacitors are connected in series: C₁ = 28 μF, C ₂ = 42 μF and C₃ = 64 μF. What is the total capacitance?

A uniform piece of wire has a diameter of 0.30 mm and length 2.25 m has a resistance of 28 Ω. Find the resistivity of the wire. 

A positive charge Q=8 mC is placed inside the cavity of a neutral spherical conducting shell with an inner radius a and an outer radius b. Find the charges induced at the inner and outer surfaces of the shell.

1. Calculate the drift velocity of the electrons in a 12-gauge copper wire which has a diameter of 2. 5 mm carrying    an 18.0 A , given that there is one free electron per copper atom. The density of copper is 8.80x10³ kg/m³_.

    atomic mass of copper = 63.54 g/mol; Avogadros number = 6.02 x 10 ²³ atoms/mol

2. Calculate the total DC resistance of a 100 meter roll of 2.0mm² copper wire if the resistivity of copper at 20⁰  C is 1.72 x 10^-8 ohm meter.

What is the potential energy if a +4 nC charge moves from infinity to point A, 5 cm away from a +3 μC charge?

A wire 75m long and 3.38cm in diameter is connected to a source of power with a potential difference of 18.25v and a current flowing of 28.92A. Assume the temperature remains constant. Calculate the resistivity of the metal.

If an electric field strength greater tham3.0*10⁶ N/C is enough to cause conduction between the plates. Find the maximum charge either of the plates can hold without conduction.

if the change in resistance of copper wire on stretching is 4%, then its length is stretched by

When a 12.0 car battery power a single 30.0w headlight how many electrons pass through it each second

A 36-ohm resistor is connected in parallel with an unknown resistor R. Their combination is then connected in series with a 12-ohm resistor. Find the value of R such that power drawn by the parallel combination of 36 ohms and R is equal to the power in the 12-ohm resistor.