Let r1 and r2 be the radius of coil 1 and coil 2 . If B1 and B2 are magnetic induction at their centre then B1=2r1μ0I1 and B2=2r2μ0I2 B1=B2 and r1=2r2 there I1=2I2 Again if R1 and R2 are resistance of the coil 2 then R1=2R2 (as R∝ length =2πr) and if v1 and v2 are the potential difference across them respectively then V2V1=I2R2I1R1=I2R2(2I2)(2R2)=4
Two circular coils 1 and 2 are made from the same wire but the radius of the 1^ st coil is twice that of the 2^ nd coil. What potential difference in…
NEET UG 2006 — Physics Electromagnetism
2006mcqmedium
Two circular coils 1 and 2 are made from the same wire but the radius of the 1st coil is twice that of the 2nd coil. What potential difference in volts should be applied across them so that the magnetic field at their centres is the same?
Official previous-year question
Held on 30 Apr 2006 · Verified 9 Jul 2026.
Options
- A
2
- B
3
- C
4
- D
6
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