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A long solenoid of 50 cm length having 100 turns carries a current of 2.5 A. The magnetic field at the centre of the solenoid is : (mu naught = 4pi . 10 ki power7 T m A1)
1) 3.14 × (10–4 T)
2) 3.14 × (10–5 T )
3) 6.28 ×( 10–4 T )
4) 6.28 × (10–5 T )
3) 6.28 ×( 10–4 T )