In the figure shown R is a fixed conducting ring of negligible resistance and radius ‘a’…
Physics · JEE Advanced · NTA Exams — Electromagnetic Induction and Alternating Currents
In the figure shown R is a fixed conducting ring of negligible resistance and radius ‘a’. PQ is a uniform rod of resistance r. It is hinged at the centre of the ring and rotated about this point in clockwise direction with a uniform angular velocity ω. There is a uniform magnetic field of strength B pointing inwards, ‘r’ is a stationary resistance.
- current through r is zero
- current through r is 2Bωa2/5r
- Direction of current in external r is from centre to circumference
- Direction of current in external r is from circumference to centre.
Answer
(B) current through r is 2B ω a 2 /5r, (D) Direction of current in external r is from circumference to centre.
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