How can resistance be useful and where can they be useful?

-- Resistance can be useful among the population of a repressive government.
Although it can be dangerous for those who resist, it can also exert pressure
against the regime to alter its repressive practices.

-- Resistance can also be useful in electronic circuits. "Lumped" components with
known numerical values of resistance are used to divide voltage, limit current, and
dissipate controlled amounts of electrical energy. 

You can find results and justify them? you can test your hypothesis

Answerapplying a direct current to a non magnetic material in order to create a electromagnetic field; plz check first good luck;