Question

A solenoid of length 1.5 m and 4 cm diameter possesses 10 turns per cm. A current of 5A is flowing through it, the magnetic induction at axis inside the solenoid is $$(\mu_0 = 4 \pi \times 10^{-7} weber amp^{-1} m^{-1})$$

A
4π×105gauss
B
2π×105gauss
C
4π×105tesla
D
2π×105tesla

Solution

The correct option is D $$2 \pi \times 10^{-5} tesla$$$$B = \mu_0 n I = 4 \pi \times 10^{-7} \times 10 \times 5 = 2 \pi \times 10^{-5} T$$.Physics

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