The magnetic flux density at a point on the axis of a long solenoid having 1000 turns/m when it is carrying a current of 3.4 A is nearly,

$1.4 \times 10^{-3} T$ $2.8 \times 10^{-4} T$ $3.5 \times 10^{-4} T$ $4.4 \times 10^{-3} T$

$4.4 \times 10^{-3} T$

The correct answer is Option (4) → $4.4 \times 10^{-3} T$