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An electromagnet is a _ _ _ _ _ _ _ _ _ _ _ _ _ _ magnet because it retains magnetic properties only when electric current passes through it.A freely suspended magnet always aligns itself in the _ _ _ _ _ _ _ _ _ _ _ _ _ _ direction.According to Faraday’s second law, the magnitude of the induced current is directly proportional to the rate at which the _ _ _ _ _ _ _ _ _ _ _ _ _ _ associated with the coil changes.Since any substance made of iron, nickel, or cobalt will be attracted to a magnet, _ _ _ _ _ _ _ _ _ _ _ _ _ _ is considered the surest test of magnetism.A magnet which occurs naturally in the Earth is called a _ _ _ _ _ _ _ _ _ _ _ _ _ _.The armature in an electric bell is made of _ _ _ _ _ _ _ _ _ _ _ _ _ _.Unlike a CT scan, there is no exposure to _ _ _ _ _ _ _ _ _ _ _ _ _ _ during an MRI scan.The branch of physics which deals with the magnetic effect of electric current is called _ _ _ _ _ _ _ _ _ _ _ _ _ _.Materials like glass, wood, plastic, and copper which are not attracted by a magnet are called _ _ _ _ _ _ _ _ _ _ _ _ _ _ materials.The strength of an electromagnet is directly proportional to the amount of _ _ _ _ _ _ _ _ _ _ _ _ _ _ flowing through the coil.One of the naturally occurring magnets in the Earth is magnetite, which has the chemical formula _ _ _ _ _ _ _ _ _ _ _ _ _ _.The current produced in a conductor by the process of electromagnetic induction is called _ _ _ _ _ _ _ _ _ _ _ _ _ _ current.It is impossible to have a magnet with only one pole because magnetic poles always exist in _ _ _ _ _ _ _ _ _ _ _ _ _ _.On increasing the number of turns of the coil, the strength of the electromagnet _ _ _ _ _ _ _ _ _ _ _ _ _ _.The pioneer experimentalist who discovered electromagnetic induction in the year 1831 was _ _ _ _ _ _ _ _ _ _ _ _ _ _.A type of magnet in which a magnetic field is produced through electric current is called an _ _ _ _ _ _ _ _ _ _ _ _ _ _.The end of an electromagnet where the current flows in a clockwise direction acts as the _ _ _ _ _ _ _ _ _ _ _ _ _ _.The magnetic force of a magnet is always maximum at its _ _ _ _ _ _ _ _ _ _ _ _ _ _.A sensitive instrument used for measuring small electric currents is called a _ _ _ _ _ _ _ _ _ _ _ _ _ _.The most basic law of magnetism is that like poles of two magnets _ _ _ _ _ _ _ _ _ _ _ _ _ _ each other.The phenomenon of producing an electric current in a conductor due to change in the magnetic lines of force associated with the conductor is called _ _ _ _ _ _ _ _ _ _ _ _ _ _.An electromagnet consists of a coil of insulated copper wire wound on a soft iron piece called the _ _ _ _ _ _ _ _ _ _ _ _ _ _.In an electric bell, the terminals T₁ and T₂ are connected to a battery through a _ _ _ _ _ _ _ _ _ _ _ _ _ _ switch.MRI is an abbreviation for _ _ _ _ _ _ _ _ _ _ _ _ _ _ Scan.
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Chapter: 08. Magnetism
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