Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • Medical
  • A wire carries a current. Maintaining the same current it is bent first to form a circular plane coil of one turn which produces a magnetic field B at the centre of the coil. The same length is now

A wire carries a current. Maintaining the same current it is bent first to form a circular plane coil of one turn which produces a magnetic field B at the centre of the coil. The same length is now bent more sharply to give a double loop of smaller radius. The magnetic field at the centre of the double loop, caused by the same current is

Option: 1

4B


Option: 2

B / 4


Option: 3

B / 2


Option: 4

2 B


Answers (1)

best_answer

Let I be current and l be the length of the wire. For Ist case :\mathrm{B}=\frac{\mu_0 \mathrm{In}}{2 \mathrm{r}}=\frac{\mu_0 \mathrm{I} \times \pi}{\mathrm{l}}where    2 \pi \mathrm{r}=\mathrm{l} and n=1 For IInd Case

: l=2\left(2 \pi r^{\prime}\right) \Rightarrow r^{\prime}=\frac{l}{4 \pi}

\mathrm{B}^{\prime}=\frac{\mu_0 \mathrm{nI}}{2 \mathrm{r}^{\prime}}=\frac{\mu_0 2 \mathrm{I}}{2 \frac{\mathrm{l}}{4 \pi}}=\frac{4 \mu_0 \mathrm{I} \pi}{\mathrm{l}}=4 \mathrm{~B}

Posted by

Info Expert 30

View full answer

NEET 2024 Most scoring concepts

    Just Study 32% of the NEET syllabus and Score up to 100% marks

Similar Questions

Trending Articles/News

anam-khan

AIIMS issues NEET UG round 1 reporting guidelines 2025; MBBS classes to start on August 18
anam-khan

NEET BSc Nursing Seat Matrix 2025: MCC to fill 507 seats in 9 institutes across Delhi, Karnataka, UP
anam-khan

NEET UG 2025 Deemed University Seat Matrix: 13,939 seats in 88 institutions; reservation policy explained

Latest Question