Question

What is the effect of the following variables on the strength of an electromagnet
1. tightness of the wire colled around the nail
2. number of coils of wre around the nail
3. number of dry cells used
4. size of nail​

Answer 1

Concept Introduction:-

The electric movement of currents causes magnetism, which is a physical phenomenon charge, which produces attracted and repellent forces between objects.

Explanation:-

A question has been provided to us

We need to find the solution to the question

The strength of an electromagnet is given by the following relation;

$B=\frac{\mu_{0} \cdot K \cdot N \cdot I}{L}$

Where;

$B=$ The magnetic field strength at the center

$\mu_{0}=$ The magnetic permeability of free space $=4 \cdot \pi \times 10^{-7} \mathrm{~N} \cdot \mathrm{A}^{-2}$

$\mathrm{N}=$ The number of loops formed by the conductor around the core

$I =$ The current flowing through wire coiled around the nail

$\mathrm{K}=$ The magnetic permeability of the nail

$L=$ The length of the coil

Therefore, we have;

$1$. From the above equation, the tightness of the wire coil around the nail (or the radius, ‘R’, of the wire) does not does not affect the magnetic field strength.

$2$. The number of coils, ‘N’, is directly related to the magnetic field strength, ‘B’, and therefore, increasing the number of turns or coils around the nail, increases the magnetic field strength.

$3$. The current in the circuit is directly related to the magnetic field strength and the number of dry cell used increases the current in the circuit and therefore, can increase the magnetic field strength.

$4$. The size of the nail used in a solenoid and the magnetic field strength are directly related. The wider the nail, the stronger the magnetic field.

Final Answer:-

The correct answer is the correct effect of the variables.

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