A solenoid of 1200 turns is wound uniformly in a single layer on a glass tube 2 m long and 0.2 m in diameter. The magnetic intensity at the center of the solenoid when a current of 2 A flows through it is
(A) 2.4 × 103 A m-1
(B) 1.2 × 103 A m-1
(C) 1 A m-1
(D) 2.4 × 10-3 A m-1
