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Magnetic Effect of Current — Physics STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 SciencePhysicsMagnetic Effect of Current1 Mark
Question

A battery is connected between two points A and B on the circumference of a uniform conducting ring of radius r and resistance R. One of the arcs AB of the ring subtends an angle θ at the centre. The value of the magnetic induction at the centre due to the current in the ring is

(a) Proportional to 2(180°  - θ)

(b) Inversely proportional to r

(c) Zero, only if θ = 180°

(d) Zero for all values of θ
✓

Answer

(d) Zero for all values of θ

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