Biot-Savart law, magnetic field due to current loops and solenoids, Ampere's law, force on a moving charge, moving coil galvanometer.
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Q1 · Magnetic Effect of Electric Current · MEDIUM
A circular coil of radius 10 cm has 500 turns and carries a current of 1 A. What is the magnetic field at the center of the coil?
Q2 · Magnetic Effect of Electric Current · HARD
Two parallel wires carrying currents of 3 A and 5 A in the same direction are separated by 10 cm. What is the force per unit length between them?
Q3 · Magnetic Effect of Electric Current · EASY
A current carrying conductor placed in a magnetic field experiences maximum force when the angle between the conductor and magnetic field is: