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Physics Chapter 12 : Topic 9
Magnetic Field of a Solenoid with Ferrous Core
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The magnetic field of a solenoid is increased by inserting a:
Reasoning: Ferrous materials become magnetized and strengthen the magnetic field inside the solenoid.
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A ferrous core increases the magnetic field of a solenoid because it:
Reasoning: Iron aligns its magnetic domains and produces an additional magnetic field.
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The main purpose of using a ferrous core in a solenoid is to:
Reasoning: A ferrous core makes the solenoid a much stronger electromagnet.
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A solenoid with an iron core is called:
Reasoning: A current-carrying solenoid with an iron core acts as a strong electromagnet.
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The magnetic field inside a solenoid increases when:
Reasoning: Ferrous cores increase magnetic field strength by becoming magnetized.
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Ferrous materials are useful in electromagnets because they have:
Reasoning: High permeability allows ferrous materials to concentrate magnetic field lines.
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When a ferrous core is placed inside a solenoid, the magnetic field lines:
Reasoning: The iron core increases the density of magnetic field lines.
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The magnetic domains in an unmagnetized iron core are:
Reasoning: Before magnetization, iron domains have random orientations.
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When current flows through a solenoid containing a ferrous core, the domains of the core:
Reasoning: The external magnetic field aligns the magnetic domains of iron.
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Which material would produce the strongest electromagnet?
Reasoning: Soft iron has high magnetic permeability and is easily magnetized.
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A ferrous core is preferred in electromagnets because it:
Reasoning: Soft iron quickly responds to changing magnetic fields and loses magnetism when current stops.
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If the ferrous core is removed from a solenoid, the magnetic field:
Reasoning: Without the ferrous core, the field strength is reduced.
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The magnetic field strength of a solenoid depends on:
Reasoning: Field strength increases with current, turns per unit length, and core material.
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The addition of a ferrous core changes the solenoid by:
Reasoning: The iron core becomes magnetized and strengthens the overall field.
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Which statement about a ferrous core is correct?
Reasoning: Ferrous cores enhance the magnetic field produced by the solenoid.
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The magnetic field of an air-core solenoid compared with an iron-core solenoid is:
Reasoning: Iron increases magnetic field strength due to its high permeability.
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The reason iron concentrates magnetic field lines is that it:
Reasoning: High permeability allows magnetic fields to pass easily through iron.
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Which type of core is most commonly used in electromagnets?
Reasoning: Soft iron provides strong magnetization and can be easily switched off.
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If the current in a solenoid is switched off, a soft iron core:
Reasoning: Soft iron has low retentivity, so it loses magnetism when current stops.
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An electromagnet with a ferrous core is stronger than a simple solenoid because:
Reasoning: The magnetized core contributes additional magnetic field.
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Increasing the number of turns in a solenoid with an iron core will:
Reasoning: More turns create a stronger magnetic field that magnetizes the core more effectively.
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A ferrous core increases magnetic field mainly by increasing:
Reasoning: Greater permeability allows stronger magnetic fields inside the material.
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Which of the following will NOT increase the magnetic field of a solenoid?
Reasoning: Plastic does not significantly increase magnetic field strength.
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The magnetic field of an electromagnet can be controlled by:
Reasoning: Magnetic field strength depends on the current flowing through the solenoid.
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The core of an electromagnet should usually be made of:
Reasoning: Soft iron is easily magnetized and demagnetized, making it suitable for electromagnets.
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A solenoid with a ferrous core is stronger because:
Reasoning: The iron core becomes a temporary magnet and strengthens the solenoid.
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Magnetic field lines inside an iron-core solenoid are:
Reasoning: Iron increases magnetic flux density inside the solenoid.
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The use of a ferrous core in a solenoid demonstrates that:
Reasoning: Magnetic materials modify and strengthen magnetic fields.
29 / 30
Which property makes soft iron suitable for electromagnets?
Reasoning: Soft iron becomes magnetized easily and loses magnetism quickly.
30 / 30
The strongest magnetic field is produced by:
Reasoning: A current-carrying solenoid with a soft iron core produces a strong electromagnet.
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