What is a Solenoid? Draw the pattern of the magnetic field lines around a current carrying solenoid. Mark on the pattern the region where the magnetic field is uniform.
What is a Solenoid? Draw the pattern of the magnetic field lines around a current carrying solenoid. Mark on the pattern the region where the magnetic field is uniform.
Definition of Solenoid
A coil of many circular turns of insulated copper wire wrapped closely in the shape of a cylinder is called a solenoid.
Pattern of Magnetic Field Lines
The magnetic field lines around a current-carrying solenoid are similar to those of a bar magnet. One end of the solenoid behaves as a magnetic north pole, while the other behaves as a south pole. Inside the solenoid, the field lines are in the form of parallel straight lines.
Region of Uniform Magnetic Field
The magnetic field is uniform inside the solenoid. This is indicated by the parallel straight magnetic field lines inside the coil, showing that the magnetic field strength and direction are the same at all points inside the solenoid.
Marking Scheme
- 11 mark
- 21 mark
- 31 mark
Hint
Recall that a solenoid behaves exactly like a bar magnet. Think about where the field lines are parallel and straight to find the uniform region.
Quick Oral Answer
A solenoid is a long coil containing a large number of close turns of insulated copper wire. Inside a current-carrying solenoid, the magnetic field is uniform because the field lines are parallel straight lines.
Analysis & Explanation
The magnetic field lines of a solenoid form continuous closed loops. Inside the solenoid, the field lines run from the south pole to the north pole and are parallel to each other, indicating a uniform magnetic field. Outside the solenoid, they emerge from the north pole and merge at the south pole, just like a bar magnet. The strength of the magnetic field inside the solenoid depends on the current passing through it and the number of turns per unit length.
Common Mistakes
- 1Forgetting to draw arrows indicating the direction of magnetic field lines (from North to South outside, and South to North inside).
- 2Drawing intersecting field lines, which is physically impossible.
- 3Stating that the field is uniform outside the solenoid instead of inside.
Interesting Facts
The strong uniform magnetic field inside a solenoid can be used to magnetize a piece of magnetic material, like soft iron, placed inside the coil. The magnet so formed is called an electromagnet.
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Frequently Asked Questions
How many marks does this question carry in CBSE Class 10 Science 2022?
This question carries 3 marks in the CBSE Class 10 Science 2022 examination.
Which chapter does this question come from in Science?
This question is from the chapter "Magnetic Effects of Electric Current" in the CBSE Class 10 Science syllabus.
What topic does this question cover in Science?
This question covers the topic "Magnetic Field due to a Current in a Solenoid" from CBSE Class 10 Science.
What type of question is this in the CBSE Class 10 Science 2022 paper?
This is a Short Answer question from Section SECTION B in the CBSE Class 10 Science 2022 paper.