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Magnetics question

2022 · 30 Jun · Shift 1 · Q50
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  5. /2022 · 30 Jun · Shift 1 · Q50

Magnetics question

2022 · 30 Jun · Shift 1 · Q50

JEE MainPhysicsMagneticsMCQ+4 / −1
A coil of n number of turns wound tightly in the form of a spiral with inner and outer radii r1 and r2 respectively. When a current of strength I is passed through the coil, the magnetic field at its centre will be :
  1. A
    μ0nI2(r2−r1){{{\mu _0}nI} \over {2({r_2} - {r_1})}}2(r2​−r1​)μ0​nI​
  2. B
    μ0nIr2{{{\mu _0}nI} \over {{r_2}}}r2​μ0​nI​
  3. C
    μ0nIr2−r1log⁡er1r2{{{\mu _0}nI} \over {{r_2} - {r_1}}}{\log _e}{{{r_1}} \over {{r_2}}}r2​−r1​μ0​nI​loge​r2​r1​​
  4. D
    μ0nI2(r2−r1)log⁡er2r1{{{\mu _0}nI} \over {2({r_2} - {r_1})}}{\log _e}{{{r_2}} \over {{r_1}}}2(r2​−r1​)μ0​nI​loge​r1​r2​​
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