The magnetic field at a point on the axis of a long solenoid having 5 turns per cm

The magnetic field at a point on the axis of a long solenoid having 5 turns per cm length when a current of 0.8 A flows through it is

Options

(a) 5.024×10⁻⁸ Wb/m²
(b) 6.024×10⁻⁸ Wb/m²
(c) 7.024×10⁻⁸ Wb/m²
(d) 8.024×10⁻⁸ Wb/m²

Correct Answer:

5.024×10⁻⁸ Wb/m²

Explanation:

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