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NCERT Class 10 Science Magnetic Effects of Electric Current: In-text questions (page 200) Solutions

Step-by-step working for every question of In-text questions (page 200) in NCERT's Class 10 Science book, chapter “Magnetic Effects of Electric Current”, written by Shishya. Each question is in our own short words; open the NCERT chapter for the exact wording and figures.

1. In-text (page 200) Q1

   Describe the magnetic field lines around a bar magnet.

   1. Magnetic field lines are imaginary curves that show the direction of the magnetic field around a magnet.
   2. The lines emerge from the North pole of the bar magnet and enter the South pole.
   3. Outside the magnet, the field lines travel from the North pole to the South pole.
   4. Inside the magnet, the lines travel from the South pole to the North pole to form closed loops.
   5. The lines never intersect each other because the field direction at any point is unique.
   6. The density of the lines indicates the strength of the magnetic field, being closest near the poles.
   7. The tangent to a field line at any point gives the direction of the magnetic field at that point.

   Answer: Magnetic field lines form closed loops, emerging from the North pole and entering the South pole outside the magnet, with density indicating field strength.

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2. In-text (page 200) Q2

   List the properties of magnetic field lines.

   1. Magnetic field lines are closed curves that form continuous loops.
   2. Outside a magnet, the lines travel from the North pole to the South pole.
   3. Inside the magnet, the lines travel from the South pole to the North pole.
   4. The lines never intersect each other at any point in space.
   5. The density of the lines indicates the strength of the magnetic field.
   6. A tangent drawn at any point on a line gives the direction of the field there.

   Answer: Magnetic field lines are closed loops, go from N to S outside and S to N inside, never intersect, and their density shows field strength.

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3. In-text (page 200) Q3

   Why do two magnetic field lines never cross?

   1. A magnetic field line represents the direction of the magnetic field at any specific point in space.
   2. If two field lines were to cross at a point, it would imply that the magnetic field has two different directions at that exact same location.
   3. However, the magnetic field at any single point can only have one unique direction at a time.
   4. Therefore, it is physically impossible for two magnetic field lines to intersect or cross each other.

   Answer: Two magnetic field lines never cross because the magnetic field at any point can have only one direction, and crossing would imply two different directions at the same point.

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