Read the statements below and answer the questions that follow
PHYSICS · Subjective · CBSE · Physics · Moving Charges and Magnetism · Moving Charges and Magnetism
Problem
Read the statements below and answer the questions that follow.
(i) Outside an ideal long solenoid carrying a steady current, the magnetic field is taken to be practically zero. Explain the physical reason for this observation.
(ii) Two identical solenoids are wound with different turn densities n1 and n2 (n2>n1) but carry the same current. Compare the magnetic fields inside them, giving suitable justification.
(iii) A soft-iron core is inserted inside one of the solenoids in (ii) while keeping the current unchanged. Describe qualitatively how the magnetic field inside that solenoid is affected and why.