If two charges each of one coulomb are separated by a distance 1 metre, than the
force between them is approximately
(a) 2.2 newton
(6) 8.85 x 1012 newton
(c) 1.6 x 1019 newton
(d) 9 x 109 newton.
​

The current in a hair dryer measures 11 amps. the resistance of the hair dryer is 12 ohms. what is the voltage?unit:

How can you increase the strength of an electromagnet?

Air is contained in a variable-load piston-cylinder device equipped with a paddle wheel. initially, air is at 400 kpa and 17°c. the paddle wheel is now turned by an external electric motor until 75 kj/kg of work has been transferred to air. during this process, heat is transferred to maintain a constant air temperature while allowing the gas volume to triple. calculate the required amount of heat transfer in kj/kg.