Exams › JEE Main › Physics

Inside a bar magnet, the magnetic field lines are directed

1. from the north pole to the south pole of the magnet
2. they are absent inside the magnet
3. they vary with the cross-sectional area of the bar magnet
4. from the south pole to the north pole of the magnet

Correct answer: from the south pole to the north pole of the magnet

Solution

Inside a bar magnet, the magnetic field lines flow from the south pole to the north pole, which is the opposite direction of the external field lines. This is a fundamental characteristic of magnetic fields, where the lines always complete a loop from north to south outside the magnet and south to north inside.

Related JEE Main Physics questions

• The SI unit Weber is used for measuring which of the following quantities?
• Two identical magnetic dipoles, each having magnetic moment 1.0 A·m², are kept 2 m apart with their axes mutually perpendicular. The magnetic field at the midpoint between them is
• A material has relative permittivity εr and relative permeability μr. For a diamagnetic substance, which pair of values is physically permissible?
• A bar magnet freely suspended in the horizontal component of Earth’s magnetic field H has a time period of 4 s. If a second magnet is placed nearby and the time period becomes 2 s, then the magnetic field produced by the second magnet is:
• Which magnetic properties should the core material possess to be suitable for an electromagnet?
• A bar magnet has a length much greater than its width and thickness. In a vibration magnetometer, its oscillation period is 2 s. The magnet is then divided lengthwise into three equal pieces, and the three pieces are stacked together so that like poles are in contact. What is the oscillation period of this arrangement?

⚔️ Practice JEE Main Physics free + battle 1v1 →