Electric Circuits Answers

Calculate the resistance value if there are two resistance with one of them having 10 ohms and the second as an unknown where the total resistance is 15 Ohms

What is the difference between emission and absorption spectra? [2] (b) Name two applications of emission and absorption spectra. [2] (c) Describe how the absorption and emission spectra of the gases in the atmosphere give rise to the Greenhouse Effect

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. (a) 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? [3] (b) 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. [3] (c) 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. 

Calculate the electric field at one corner off a square 80𝑐𝑚 on a side if the other three corners are occupied by charges each of magnitude 18.2 x 10-4C.

A lamp is operated for 20 seconds with a current of 10A which supplies 400J of energy.

a) How much charge flows through the lamp?

b) How much energy each coulomb of charge transfer to the lamp?

c) Calculate the potential difference across the lamp.

A battery has a negligible internal resistance, an Emf of 12v, and a capacity of 100Ah(ampere-hour). Calculate:

a) The total charge it can supply

b) The total energy it can transfer

c) If the battery is connected to 27watts. Calculate the energy of the lamp.

A charge of uniform linear density /m is distributed along a Long, thin, non conducting rod. The with a long conducting cylindric shell (inner raclius =5.0 cm , outer rudius The nel charge on the shell is ) what is the magnitude of the electric held from the axis of the shell ? What is the curface charge density on the b) inner and c ) outer surface of the shell ?

Someone decides to replace six 60 watt filament bulbs with six 15 watt low energy bulbs . If energy costs 10 cu per unit and the bulbs are used , on average, for 4 hours per day what will the annual saving be?

• A 1 capacitance is charged using a constant of 10 for 20 seconds . What is the energy finally stored by the capacitor
  

Draw the net electric force on a +1-C charge placed at the center of:

a. A line segment of length 1.0 m with a +1-C charge and a –1-C charge at its endpoints;

Calculate the magnitude and determine the direction of the net electric force on the +1-

C charge placed at the center of configurations in a, b, and c.