JEE Mains · Physics · STD 12 - Magnetism and matter
- JEE Mains 2021
- Medium
- MCQ
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. \((E)\) \(\chi=-1\) is the condition for a perfect diamagnetic material, where \(\chi\) is its
magnetic susceptibility. Choose the correct answer from the options given below:
Pick an option to check your answer.
Answer & Solution
Correct Answer
(A) \((C)\) and \((E)\) only
Step-by-step Solution
Detailed explanation
Statement \(( C )\) is correct because, the magnetic field outside the toroid is zero and they form closed loops inside the toroid itself.
Statement \(( E )\) is correct because we know that super conductors are materials inside which the net magnetic field is always zero and they are perfect diamagnetic.
\(\mu_{ r }=1+\chi\)
\(\chi=-1\)
\(\mu_{ r }=0\)
For superconductors.
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