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A copper wire having resistance 0.01ohm in each metre is used to wind a 400-turn solenoid of radius 1.0cm

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A copper wire having resistance 0.01ohm in each metre is used to wind a 400-turn solenoid of radius 1.0cm and length 20cm. Find the emf of a battery which when connected across the solenoid will cause a magnetic field of 1.0 x 10-2T near the centre of the solenoid.

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R/I = 0.01Ω in 1 m, r = 1.0cm Total turns = 400, ℓ = 20cm,

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