Acurrent of 0.86 a flows through a copper wire 0.47 mm in diameter when it is connected to a potential difference of 15 v. how long is the wire?

To calculate the length of the wire, we use formulas,

                                      (A)

                               (B)

Here, R is the resistance of the wire, I is the current flows through wire and V is potential difference. A is cross sectional area of wire and is the density of copper wire and is value,.

Given    

Substituting the values of I and V in equation (A ) we get,

Now from equation (B),

Therefore,

Thus the length of the copper wire is 177.9 m.

answer: d. a cme increases the amount of energy in the solar wind

explanation:

coronal mass ejections, also called cmes, are large clouds of plasma and magnetic field that erupt from the sun. only when the cloud is aimed at earth will the cme hit earth and therefore cause impacts. high-speed solar wind streams come from areas on the sun known as coronal holes.

a longitudinal wave moves energy that is to the direction of the wave’s movement. - true