A solenoid of length 0.5 m and radius 10 cm has 500 turns. If a current of 5 A flows through it, the magnetic field produced inside the solenoid will be:

1.4 × 10-3 T 2.8 × 10-3 T 4.8 × 10-3 T 6.28 × 10-3 T

2.8 × 10-3 T

$B = \mu_0 ni = 4\pi \times 10^{-7}\times 1000\times 5 = 2.8\times 10^{-3}T$