Physics problems: electricity

resistor and resistance



Problem 62.

A copper wire has a diameter of 0.5 mm and resistivity of resistivity. What will be the length of this wire to make its resistance of 2 ohm?



Problem 63.

How does the resistance of a wire change when
1. Its length is tripled?
2. Its diameter is tripled?
3. Its material is changed to one whose resistivity is three times?






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