When a voltage difference is applied to a piece of metal wire, a 5.0 ma current flows through it. if this metal wire is now replaced with a silver wire having twice the diameter of the original wire, how much current will flow through the silver wire? the lengths of both wires are the same, and the voltage difference remains unchanged. (the resistivity of the original metal is 1.68 � 10-8 ? ? m, and the resistivity of silver is 1.59 � 10-8 ? ? m.)
answer
5.3 ma
11 ma
19 ma
21 ma

What property of an object determines its inertia?

The energy equivalent of the rest mass of an electron is

Cells in the nervous system have a potential difference of 70 mv across the cell membrane separating the interior of the cell from the extracellular fluid. this potential difference is maintained by ion pumps that move charged ions across the membrane. is this an emf? select the correct answer and explanation. 1)no. the ion pumps cannot separate charges; thus, they cannot create a potential difference. 2)yes. the ion pumps cannot separate charges, but they still can create a potential difference. 3)yes. the ion pumps can actively separate charge; thus, they can create a potential difference. 4)no. the ion pumps can separate charges, but they cannot create a potential difference.