Electric Circuits Answers

A conducting sphere of radius 4×10^-3 has a charge 6.66pc.find workdone in bringing a unit charge to the surface of the sphere from infinity

Electrophoresis is a medical therapy technique used to deliver medicaments into the patients body with help of an electric current. During the procedure, two oppositely charged plates are applied to the body providing flow of the current through the tissue. Suppose that current used in first five procedures was 7 mA (duration of the procedure 6 min) and during the last fifteen procedures 14 mA (duration 15 min). Find charge that passes through the body during 20 electrophoresis procedures.

1. Calculate the capacitance of a capacitor whose plates are 25cm x 4.0 cm and are separated by a 2.0mm air gap.
2. What is the charge on each plate if the capacitor is connected to a 12.0 V battery?
3. What is the electric field between the plates?

A 0.40 mm diameter copper wire carries a current of

3μA. Find the current density and he electron drift density in the wire

Battery A 12.6 volts with an internal resistance of 0.2 ohm and battery B 12.2 volts with an internal resistance of 0.3 ohm are delivering a current through the load RL=10 ohms. Find the voltage across the load.

Three resistor are connected in parallel across 100-volt supply. One resistor absorb 1600 watts and the second 1200 watts. The total energy used by the whole circuit in 10 minutes is 276x10^4 joules. Find resistance of the third resistor.

A certain class of lamp takes 0.45A at 220V. How many such lamp can be run for an expenditure of power equal to 1 1/3 horsepower?

A certain copper wire has a resistance of 25 ohms at 10 degrees Celsius. Take the temperature coefficient at 10 degrees Celsius to be 0.00405. What must be the maximum operating temperature of the wire if its resistance is to increase by at most 20%.

A 1000mf capacitor is charged to 10v and 16uf capacitor is charged to 400v.these are then connected in parallel with plates carrying similar charges connected together. Determined the total stored energy before and after joining them. Is final energy the same as the initial energy?

A 1000mf capacitor is charged to 10v and 16uf capacitor is charged to 400v.these are connected in parallel with plates carrying similar charges.Determined the total stored energy before and after joining them.