Q. 4

Expert-verifiedFound in: Page 762

Book edition
4th

Author(s)
Randall D. Knight

Pages
1240 pages

ISBN
9780133942651

Electrons flow through a diameter aluminum wire at . How many electrons move through a cross-section of the wire each day?

The number of electrons moves through a cross-section of the wire each day is

Aluminum wire diameter

Time

The electron density is given as,

Where is the area of the cross-section.

Number of electrons passing in time , the electron density is by,

The number of electrons as

Substituting the expression for the electron intensity,

Simplify the expression,

Hence, the number of electrons move through a cross-section of the wire each day is

You've been asked to determine whether a new material your company has made is ohmic and, if so, to measure its electrical conductivity. Taking a sample, you wire the ends of the long axis to a power supply and then measure the current for several different potential differences. Your data are as follows:

Voltage (V) | Current (A) |

0.200 | 0.47 |

0.400 | 1.06 |

0.600 | 1.53 |

0.800 | 1.97 |

Use an appropriate graph of the data to determine whether the material is ohmic and, if so, its conductivity.

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