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BITSAT 2009
Exam
BITSAT
Year
2009
Subject
Physics
Chapter
Magnetic Effects of Current

BITSAT 2009 · Physics · Magnetic Effects of Current

A conducting circular loop of radius r carries a constant current...

A conducting circular loop of radius rr carries a constant current i.i. It is placed in a uniform magnetic field \overrightarrow{\mathrm{B}_{0} such that \overrightarrow{\mathrm{B}_{0} is perpendicular to the plane of the loop. The magnetic force acting on the loop isA conducting circular loop of radius r carries a constant current i. It is placed in a uniform magnetic field B_ 0 such

Options

  1. AirB0i r \mathrm{ B}_{0}
  2. B2πirB02 \pi i r \mathrm{ B}_{0}
  3. Czero
  4. Dπ\pi ir B0\mathrm{B}_{0}

Correct answer

C. zero

Step-by-step solution

The magnetic field is perpendicular to the plane of the paper. Let us consider two diametrically opposite elements. By Fleming's Left hand rule on element AB\mathrm{AB} the direction of force will be Leftwards and the magnitude will be dF=Idl⁡Bsin⁡90∘=IdIB\mathrm{dF}=\operatorname{Idl} \mathrm{B} \sin90^{{}^{\circ}}=\mathrm{IdIB}A conducting circular loop of radius r carries a constant current i. It is placed in a uniform magnetic field B_ 0 such
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