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A single circular loop of wire with radius \( 0.02 \mathrm{~cm} \) carries a current of \( 8.0 \mathrm{~A} \). It is placed at the centre of a solenoid that has length \( 0.65 \mathrm{~m} \), radius \( 0.080 \mathrm{~m} \) and 1300 turns.
(A) The value of the current in the solenoid so that the magnetic field at the centre of the loop becomes
zero, is equal to \( 4.4 \mathrm{~A} \).
(B) The value of the current in the solenoid so that the magnetic field at the centre of the loop becomes zero, is equal to \( 10 \mathrm{~A} \).
(C) The magnitude of the total magnetic field at the centre of the loop (due to both the loop and the solenoid) if the current in the loop is reversed in direction from that needed to make the total field equal to zero \( \mathrm{T} \) esla, is \( 8 \pi \times 10^{-3} \mathrm{~T} \).
(D) The magnitude of the total magnetic field at the centre of the loop (due to both the loop and the
solenoid) if the current in the loop is reversed in direction from that needed to make the total field equal to zero Tesla, is \( 16 \pi \times 10^{-3} \mathrm{~T} \).
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