To solve this problem, we need to understand the concept of magnetic susceptibility.$\\$Magnetic susceptibility $(\chi)$ is a measure of how much a material will become magnetized in an applied magnetic field.$\\$There are three main types of magnetic materials:$\\$• Ferromagnetic materials: These have a large positive susceptibility and are strongly attracted to magnetic fields.$\\$• Paramagnetic materials: These have a small positive susceptibility and are weakly attracted to magnetic fields.$\\$• Diamagnetic materials: These have a negative susceptibility and are weakly repelled by magnetic fields.$\\$Given the options, we need to identify which type of material has a negative magnetic susceptibility.$\\$• Option 1: Ferromagnetic material only.$\\$ - Ferromagnetic materials have a positive susceptibility, so this option is incorrect.$\\$• Option 2: Paramagnetic and ferromagnetic materials.$\\$ - Both paramagnetic and ferromagnetic materials have positive susceptibility, so this option is incorrect.$\\$• Option 3: Diamagnetic material only.$\\$ - Diamagnetic materials have a negative susceptibility, so this option is correct.$\\$• Option 4: Paramagnetic material only.$\\$ - Paramagnetic materials have a positive susceptibility, so this option is incorrect.$\\$Therefore, the correct answer is Option 3: Diamagnetic material only.