Question

The number density of free electrons in a copper conductor estimated is 9× 1026 m

–3

. How long does an

electron take to drift from one end of a wire 3.0 m long to its other end? The area of cross section of the

cross section of the wire is 3.0×10–6 m

2

and it is carrying a current of 3.0 A.​

Answer 1

Explanation:

Some scales, such as the traditional beam balance, measure mass directly by counteracting the downward force by another equal downward force on the opposite side of the pivot. On a beam balance, you add enough mass to the opposite pan to counterbalance the unknown mass. No force is measured.