JEE Exam  >  JEE Questions  >  A current passing through a circular coil of ... Start Learning for Free
A current passing through a circular coil of two produces a magnetic field of 8 T at its centre. The coil is then rewound, so as to have four turns and current is passed through it is doubled. Now magnetic field at the centre of the coil will be
  • a)
    64 T
  • b)
    32 T
  • c)
    16 T
  • d)
    8 T
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
A current passing through a circular coil of two produces a magnetic f...
Given:

- Original coil has 2 turns and produces a magnetic field of 8 T at its centre
- Coil is rewound to have 4 turns
- Current passing through the coil is doubled

To find:

- Magnetic field at the centre of the coil

Solution:

1. Magnetic field of original coil

- Magnetic field at the centre of a circular coil is given by the formula:

B = μ₀ * I * N / (2 * R)

where B is the magnetic field, μ₀ is the permeability of free space (4π x 10^-7 Tm/A), I is the current, N is the number of turns in the coil, and R is the radius of the coil.

- Plugging in the given values:

8 T = (4π x 10^-7 Tm/A) * I * 2 / (2 * R)

Simplifying:

R = π x 10^-6 m

2. Magnetic field of rewound coil

- The number of turns in the coil is now 4, and the current passing through it is doubled. Using the same formula as before:

B' = μ₀ * 2I * 4 / (2 * R) = 4B

- Therefore, the magnetic field at the centre of the rewound coil is 4 times the magnetic field of the original coil.

Answer:

The magnetic field at the centre of the rewound coil is 4 x 8 T = 32 T.
Free Test
Community Answer
A current passing through a circular coil of two produces a magnetic f...
64 as by these actions it will get 8 times bcoz it depends linearly with it
Explore Courses for JEE exam
Question Description
A current passing through a circular coil of two produces a magnetic field of 8 T at its centre. The coil is then rewound, so as to have four turns and current is passed through it is doubled. Now magnetic field at the centre of the coil will bea)64 Tb)32 Tc)16 Td)8 TCorrect answer is option 'A'. Can you explain this answer? for JEE 2025 is part of JEE preparation. The Question and answers have been prepared according to the JEE exam syllabus. Information about A current passing through a circular coil of two produces a magnetic field of 8 T at its centre. The coil is then rewound, so as to have four turns and current is passed through it is doubled. Now magnetic field at the centre of the coil will bea)64 Tb)32 Tc)16 Td)8 TCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for JEE 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A current passing through a circular coil of two produces a magnetic field of 8 T at its centre. The coil is then rewound, so as to have four turns and current is passed through it is doubled. Now magnetic field at the centre of the coil will bea)64 Tb)32 Tc)16 Td)8 TCorrect answer is option 'A'. Can you explain this answer?.
Solutions for A current passing through a circular coil of two produces a magnetic field of 8 T at its centre. The coil is then rewound, so as to have four turns and current is passed through it is doubled. Now magnetic field at the centre of the coil will bea)64 Tb)32 Tc)16 Td)8 TCorrect answer is option 'A'. Can you explain this answer? in English & in Hindi are available as part of our courses for JEE. Download more important topics, notes, lectures and mock test series for JEE Exam by signing up for free.
Here you can find the meaning of A current passing through a circular coil of two produces a magnetic field of 8 T at its centre. The coil is then rewound, so as to have four turns and current is passed through it is doubled. Now magnetic field at the centre of the coil will bea)64 Tb)32 Tc)16 Td)8 TCorrect answer is option 'A'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of A current passing through a circular coil of two produces a magnetic field of 8 T at its centre. The coil is then rewound, so as to have four turns and current is passed through it is doubled. Now magnetic field at the centre of the coil will bea)64 Tb)32 Tc)16 Td)8 TCorrect answer is option 'A'. Can you explain this answer?, a detailed solution for A current passing through a circular coil of two produces a magnetic field of 8 T at its centre. The coil is then rewound, so as to have four turns and current is passed through it is doubled. Now magnetic field at the centre of the coil will bea)64 Tb)32 Tc)16 Td)8 TCorrect answer is option 'A'. Can you explain this answer? has been provided alongside types of A current passing through a circular coil of two produces a magnetic field of 8 T at its centre. The coil is then rewound, so as to have four turns and current is passed through it is doubled. Now magnetic field at the centre of the coil will bea)64 Tb)32 Tc)16 Td)8 TCorrect answer is option 'A'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice A current passing through a circular coil of two produces a magnetic field of 8 T at its centre. The coil is then rewound, so as to have four turns and current is passed through it is doubled. Now magnetic field at the centre of the coil will bea)64 Tb)32 Tc)16 Td)8 TCorrect answer is option 'A'. Can you explain this answer? tests, examples and also practice JEE tests.
Explore Courses for JEE exam

Top Courses for JEE

Explore Courses
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
10M+ students study on EduRev