Question

1. interpret graphics which of the magnets below is a solenoid? which one is an electromagnet? label each one. if the current and the number of coils are the same, which of the magnets has a stronger magnetic field?

Explanation:

Step1: Recall definitions

A solenoid is a coil of wire through which an electric current flows. An electromagnet is a solenoid with a ferromagnetic core (like iron).

Step2: Analyze the first magnet

The first magnet (left - hand side) has no visible core. It is just a coil of wire with current. So, it is a solenoid.

Step3: Analyze the second magnet

The second magnet (right - hand side) has a core (the rod inside the coil). So, it is an electromagnet.

Step4: Compare magnetic fields

The magnetic field of a solenoid is \(B=\mu_0nI\) (where \(n\) is the number of turns per unit length, \(I\) is the current, \(\mu_0\) is the permeability of free space). For an electromagnet, \(B = \mu nI\) (where \(\mu\) is the permeability of the core material and \(\mu\gg\mu_0\)). When current \(I\) and number of coils (related to \(n\)) are the same, since \(\mu\gg\mu_0\), the electromagnet has a stronger magnetic field.

Answer:

The left - hand side magnet is a solenoid. The right - hand side magnet is an electromagnet. The electromagnet has a stronger magnetic field.