Created by StemPy LabA wire bent into a square of side carries a current of , as shown in the figure. Take . The magnetic field at the centre of the square is closest to
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← A copper wire with a cross-sectional area of 1.0 mm² carries a steady current of 2.72 A. Copper has 8.5 × 10²⁸ free electrons per cubic metre, and the charge of an electron is 1.6 × 10⁻¹⁹ C. The drift speed of the electrons isA long solenoid has 2000 turns per metre. A small coil of 100 turns, each of area 2 cm², sits inside it near its middle, with the same axis. The current in the solenoid is increased steadily at 50 A/s. Take µ₀ = 4π × 10⁻⁷ T m/A. The emf induced in the small coil is closest to →
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