A slab of metal of volume V is made into a rod of length L. The rod carries current I when the electric field inside is E. Find the resistivity of the metal ρ. Expess your answer in terms of the given quantities.   The rod is now stretched so that its length is doubled. If the electric field remains the same, what is the new current I′ in the rod? Express your answer in terms of some or all of the quantities given in the problem introduction.   A piece of copper is made into a rod with a square cross-section. The side of the square is 2.00 centimeters. The resistivity of copper is 1.7⋅10−8 Ω⋅m. An unknown electric field E, directed along the rod, creates a current of 12.0 amperes through the rod. Find the magnitude of E. Use two significant figures in your answer. Express your answer in newtons per coulomb.

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A: Solution:-

Microscopic view of current

In physics, the term current is expressed as the rate of flow of electric charges across the area per unit time (I=q/t). It propagates along in the direction of the motion of positive charges. When the current is caused by the motion of electrons, the direction of the current is opposite to the flow.