cse • paper_1 • electrodynamics
[UPSC CSE 1990] Electrostatics and Magnetostatics (Q276, 20M)
Starting from Biot-Savart law, calculate the magnetic field at the centre of a solenoid of length 1 meter, radius 2 cm and having 25 turns per centimeter, the current through the solenoid being 1 ampere.
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