Exams › JEE Main › Physics

Which of the following statements are correct? (A) Electric monopoles do not exist whereas magnetic monopoles exist. (B) Magnetic field lines due to a solenoid at its ends and outside cannot be completely straight and confined. (C) Magnetic field lines are completely confined within a toroid. (D) Magnetic field lines inside a bar magnet are not parallel. (E) χ = -1 is the condition for a perfect diamagnetic material, where χ is its magnetic susceptibility. Choose the correct answer from the options given below :

1. (C) and (E) only
2. (B) and (D) only
3. (A) and (B) only
4. (B) and (C) only

Correct answer: (C) and (E) only

Solution

Option (C) is correct because magnetic field lines in a toroid are indeed confined within the structure, while option (E) is accurate as a magnetic susceptibility of χ = -1 indicates a perfect diamagnetic material, which repels magnetic fields.

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 $1.0\ \text{A·m}^2$, are kept 2 m apart with their axes mutually perpendicular. The magnetic field at the midpoint between them is
• A material has relative permittivity $\varepsilon_r$ and relative permeability $\mu_r$. 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:
• A magnetic compass needle has a magnetic moment of 60 A·m² and is aligned along the geographical north at a certain location. If the torque acting on it is $1.2\times10^{-3}$ N·m and the horizontal component of Earth’s magnetic field at that place is 40 microtesla, what is the dip angle there?
• Which magnetic properties should the core material possess to be suitable for an electromagnet?

⚔️ Practice JEE Main Physics free + battle 1v1 →