In a solenoid, what is the expression for the magnetic field inside it when it c

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Question: In a solenoid, what is the expression for the magnetic field inside it when it carries a current I?

Options:

Correct Answer: B = μ₀nI

Solution:

Inside a long solenoid, the magnetic field is given by B = μ₀nI, where n is the number of turns per unit length.

In a solenoid, what is the expression for the magnetic field inside it when it carries a current I?

In a solenoid, what is the expression for the magnetic field inside it when it carries a current I?

Correct Answer: B = μ₀nI

Step 1: Understand what a solenoid is. A solenoid is a coil of wire that creates a magnetic field when an electric current passes through it.
Step 2: Identify the current (I) flowing through the solenoid. This is the electric current that generates the magnetic field.
Step 3: Know that the magnetic field (B) inside a long solenoid is related to the number of turns of wire and the current.
Step 4: Learn the formula for the magnetic field inside a solenoid: B = μ₀nI.
Step 5: Understand the terms in the formula: μ₀ is the permeability of free space (a constant), n is the number of turns of wire per unit length (how many loops of wire are in a certain length), and I is the current.

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