AIIMS 2003
- Exam
- AIIMS
- Year
- 2003
- Subject
- Physics
- Chapter
- Magnetic Effects of Current
AIIMS 2003 · Physics · Magnetic Effects of Current
The earth's magnetic field at a given point is 0.5 × 10^ -5 ~Wb /...
The earth's magnetic field at a given point is . This field is to be annulled by magnetic induction at the center of a circular conducting loop of radius . The current required to be flown in the loop is nearly
Options
- A
- B
- C
- D.
Correct answer
B.
Step-by-step solution
The magnetic field at the centre of a circular loop carrying current is given by where r=5.0 \mathrm{~cm}=0.05 \mathrm{~m}B=\frac{\mu_0 I}{2 r}=0.5 \times 10^{-5}