Electric Circuits Answers

How much energy would each coulomb of charge from a 9volt battery possess?

How much energy in joule is each coulomb of charge given as it flows through the battery?

 a circuit consisting of 9 volt battery and two 4ohm resistors connected in series. How many Coulomb flows through each resistor in a second?

a 6 volt battery is connected to a 0.3 m wire with a diameter of 1.0mm has a current of 5. ampere flows through the wire. How much current will flow if the wire is replaced by 1.20 m wire of the same wire and diameter?

If m=5 kg and M=8 kg, find the acceleration of the masses and the tension of the rope

A 300v energy source delivers 500mA for 1 hour. Calculate the energy this represent.

3. A solid conducting sphere of radius 30cm has a charge of 4 uC. If the potential is zero at infinity. Find the value of the potential at the following distances from the center of the sphere:

a) 45 cm

b) 30 cm

c) 15 cm

2. A point charge q₁ = 4.00 nC is placed at the origin, and a second point charge q₂ = -3.00 nC is placed on the x-axis at x= +20.0 cm. A third point charge q₃ = 2.00 nC is to be placed on the x-axis between q₁ and q₂. Let the potential energy of the three charges be zero when they are infinitely far apart.

a) what is the potential energy of the system of the three charges if q₃ is placed at x= +10.0 cm?

b) where should q₃ be placed to make the potential energy of the system equal to zero?

How much work is required to move a charge of 4nC from a point 2m away to a point 0.5m away from a point charge of 60nC? What is the potential difference between these points?

To make a potentiometer, a driver cell of e.m.f. 4.0 V is connected across a 1.00 m length of resistance wire.

1.What is the potential difference across each 1 cm length of the wire? What length of wire has a p.d. of 1.0 V across it?

2.A cell of unknown e.m.f. E is connected to the potentiometer and the balance point is found at a distance of 37.0 cm from the end of the wire to which the galvanometer is connected. Estimate the value of E. Explain why this can only be an estimate.

3.A standard cell of e.m.f. 1.230 V gives a balance length of 31.2 cm. Use this value to obtain a more accurate value for E.