# Current in a hollow tube problem

• milkman9000
In summary, the "Current in a hollow tube problem" is a physics problem that involves finding the magnitude and direction of the electric current flowing through a hollow tube. The key variables in this problem include the length and radius of the tube, the material's conductivity and resistivity, and the potential difference between the ends of the tube. The problem is solved using Ohm's Law and factors such as material properties, dimensions, and external factors can affect the current in a hollow tube. This problem has practical applications in fields such as electrical engineering and the study of biological systems.
milkman9000
1. A 60.0 -cm-long hollow nichrome tube of inner diameter 1.10 mm, outer diameter 4.20 mm is connected to a 3.00 V battery. What is the current in the tube?

## Homework Equations

Resistivity for nichrome = 1.5*10^-6 ohm meters
I=V/R
E=V/L

## The Attempt at a Solution

I don't know what parts you are having trouble with, but before you can use the equations you posted you have to find the Resistance with the formula R=rho*L/A your A will be pi*(outer radius - inner radius)^2. Then you can proceed.

## 1. What is the "Current in a hollow tube problem"?

The "Current in a hollow tube problem" is a physics problem that involves finding the magnitude and direction of the electric current that flows through a hollow tube, given the dimensions and material properties of the tube.

## 2. What are the key variables in the "Current in a hollow tube problem"?

The key variables in this problem include the length and radius of the tube, the material's conductivity and resistivity, and the potential difference between the ends of the tube.

## 3. How is this problem solved?

The problem is solved using Ohm's Law, which states that the current flowing through a conductor is directly proportional to the potential difference and inversely proportional to the resistance. The resistance of the hollow tube can be calculated using its dimensions and material properties.

## 4. What factors can affect the current in a hollow tube?

The current in a hollow tube can be affected by the material's conductivity and resistivity, the dimensions of the tube, and the potential difference applied. Additionally, any external factors such as temperature or magnetic fields can also influence the current.

## 5. What are some real-world applications of the "Current in a hollow tube problem"?

This problem has practical applications in various fields, such as electrical engineering, where it can be used to calculate the current flowing through conductive pipes or wires. It is also relevant in the study of biological systems, such as the flow of ions through cell membranes.

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