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Keith_Richards [23]
3 years ago
15

A rectangular solid made of carbon has sides of lengths 1.0 cm, 2.0 cm, and 4.0 cm, lying along the x, y, and z axes, respective

ly. Wires are connected to the faces and the resistance of the block is measured. The resistance will be the least when the wires are hooked up so that current flows in
Physics
1 answer:
sammy [17]3 years ago
8 0

Answer:

The correct answer is in the x-axis direction, where the distance travelled is 1.0 cm and the surface is 8 cm^{2}.

Explanation:

The electrical resistance is lower when the contact surface is larger and the length is shorter.

An electrical resistance is an opposition to the flow of electric current through a conductor. For a given conductor, the resistance is given by the following formula:

R = ρ * \frac{l}{S}

Where:

R: Electrical resistance.

ρ: Resistivity of the material.

l: Length.

S: Surface of the conductor.

Thus, the direction in which the electrical resistance is lower is when the distance is minimum and the area is greater.

Have a nice day!

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A scientist is designing a device that will mimic Earth's atmosphere by
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1. Ultraviolet light (UV)

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When temperature and pressure are applied to sedimentary and igneous rock?
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Two large thin metal plates are parallel and close to each other. On their inner faces, the plates have excess surface charge of
wariber [46]

Answer:

For left = 0  N/C

For right = 0  N/C

At middle = -7.6836 * 10^{-11} \vec{i}  N/C

Explanation:

Given data :-

б =6.8 * 10^{-22} C/ m²

Considering the two thin metal plates to be non conducting sheets of charges.

Electric field is given by

E = \frac{\sigma }{2\varepsilon }

1) To the left of the plate

\vec{E}= (\frac{\sigma }{2\varepsilon })(-\vec{i})+  (\frac{\sigma }{2\varepsilon })(\vec{i})   = 0 N/C.

2) To the right of them.

\vec{E}= (\frac{\sigma }{2\varepsilon })(-\vec{i})+  (\frac{\sigma }{2\varepsilon })(\vec{i})   = 0 N/C.

3) Between them.

\vec{E}= (\frac{\sigma }{2\varepsilon })(-\vec{i})+  (\frac{\sigma }{2\varepsilon })(-\vec{i}) = (\frac{\sigma }{\varepsilon })(-\vec{i}) = -\frac{6.8 * 10^{-22} }{8.85 * 10 ^{-12} }  \vec{i} =   -7.6836 * 10^{-11} \vec{i} N/C

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