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When the current through the coil of an electromagnet reverses, the-
- a)magnetic field collapses
- b)the direction of the magnetic field unchanged
- c)the direction of the magnetic field remains unchanged
- d)magnetic field expands
Correct answer is option 'B'. Can you explain this answer?
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When the current through the coil of an electromagnet reverses, the-a...
The direction of the magnetic field gets reversed by the coil of the electromagnet.
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When the current through the coil of an electromagnet reverses, the-a...
Explanation:
When the current through the coil of an electromagnet reverses, the direction of the magnetic field also reverses. This phenomenon is known as the right-hand rule.
Right-Hand Rule:
The right-hand rule is a simple technique used to determine the direction of the magnetic field around a current-carrying wire or a coil. It states that if you point your right thumb in the direction of the current, then the direction in which your curled fingers wrap around the wire or coil will give you the direction of the magnetic field.
Reversal of Current:
When the current through the coil of an electromagnet reverses, it means that the direction of the flow of electric charge in the coil changes. This change in current direction causes a corresponding change in the direction of the magnetic field produced by the electromagnet.
Effect on Magnetic Field:
- Option A: Magnetic Field Collapses: This option is incorrect because when the current reverses, the magnetic field doesn't collapse. Instead, it changes direction.
- Option B: Direction of Magnetic Field Unchanged: This option is incorrect. When the current reverses, the direction of the magnetic field also reverses. The magnetic field lines no longer flow in the same direction as they did before the current reversal.
- Option C: Direction of Magnetic Field Remains Unchanged: This option is incorrect. As mentioned earlier, when the current through the coil reverses, the magnetic field also reverses its direction.
- Option D: Magnetic Field Expands: This option is incorrect. When the current reverses, the magnetic field does not expand. Instead, it changes direction.
Therefore, the correct answer is option B: the direction of the magnetic field unchanged. When the current through the coil of an electromagnet reverses, the direction of the magnetic field also reverses.
When the current through the coil of an electromagnet reverses, the direction of the magnetic field also reverses. This phenomenon is known as the right-hand rule.
Right-Hand Rule:
The right-hand rule is a simple technique used to determine the direction of the magnetic field around a current-carrying wire or a coil. It states that if you point your right thumb in the direction of the current, then the direction in which your curled fingers wrap around the wire or coil will give you the direction of the magnetic field.
Reversal of Current:
When the current through the coil of an electromagnet reverses, it means that the direction of the flow of electric charge in the coil changes. This change in current direction causes a corresponding change in the direction of the magnetic field produced by the electromagnet.
Effect on Magnetic Field:
- Option A: Magnetic Field Collapses: This option is incorrect because when the current reverses, the magnetic field doesn't collapse. Instead, it changes direction.
- Option B: Direction of Magnetic Field Unchanged: This option is incorrect. When the current reverses, the direction of the magnetic field also reverses. The magnetic field lines no longer flow in the same direction as they did before the current reversal.
- Option C: Direction of Magnetic Field Remains Unchanged: This option is incorrect. As mentioned earlier, when the current through the coil reverses, the magnetic field also reverses its direction.
- Option D: Magnetic Field Expands: This option is incorrect. When the current reverses, the magnetic field does not expand. Instead, it changes direction.
Therefore, the correct answer is option B: the direction of the magnetic field unchanged. When the current through the coil of an electromagnet reverses, the direction of the magnetic field also reverses.
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When the current through the coil of an electromagnet reverses, the-a)magnetic field collapsesb)the direction of the magnetic field unchangedc)the direction of the magnetic field remains unchangedd)magnetic field expandsCorrect answer is option 'B'. Can you explain this answer?
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