What is a solenoid ? Draw the pattern of magnetic field lines of a solenoid through which a steady current flows. What does the pattern of field lines inside the solenoid indicate ?
What is a solenoid ? Draw the pattern of magnetic field lines of a solenoid through which a steady current flows. What does the pattern of field lines inside the solenoid indicate ?
A solenoid is a coil of many circular turns of insulated copper wire wrapped closely in the shape of a cylinder.
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.
Indication of Field Lines Inside:
The field lines inside the solenoid are in the form of parallel straight lines. This indicates that the magnetic field is uniform (the same at all points) inside the solenoid.
Marking Scheme
- 1Definition of solenoid (0.5 marks)
- 2Drawing the magnetic field pattern (loops outside, parallel inside) (1 mark)
- 3Stating that parallel lines indicate a uniform magnetic field (0.5 marks)
Hint
Recall the definition of a solenoid and compare its field pattern to a bar magnet.
Quick Oral Answer
A solenoid is a cylindrical coil of insulated wire. Its internal magnetic field is uniform, represented by parallel straight lines. Externally, it behaves exactly like a bar magnet.
Analysis & Explanation
According to the NCERT text, a solenoid's magnetic field pattern is nearly identical to a bar magnet's. The crucial distinction is the interior of the solenoid, where field lines are parallel, signifying a constant magnetic field strength and direction (uniformity). This uniform field is utilized in creating electromagnets by placing materials like soft iron inside the coil.
Common Mistakes
- 1Drawing field lines that intersect each other.
- 2Forgetting to show the direction of field lines (North to South outside).
Interesting Facts
A solenoid can be used to magnetize a piece of soft iron, creating an electromagnet which can be turned on or off with the current.
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Frequently Asked Questions
How many marks does this question carry in CBSE Class 10 Science 2010?
This question carries 2 marks in the CBSE Class 10 Science 2010 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 "Solenoid" from CBSE Class 10 Science.
What type of question is this in the CBSE Class 10 Science 2010 paper?
This is a Short Answer question from Section A in the CBSE Class 10 Science 2010 paper.