A long solenoid has 200 turns per cm and carries a current of 2.5 amps. The magnetic field at its centre is ( μ 0 = 4 π × 10 − 7 w e b e r / a m p − m ) Options: A . &nbsp3.14×102 weber/m2 B . &nbsp6.28×10−2 weber/m2 C . &nbsp9.42×10−2 weber/m2 D . &nbsp12.56×10−2 weber/m2

Answer: Option B : B B = μ 0 n i = 4 π × 10 − 7 × 200 10 − 2 × 2.5 = 6.28 × 10 − 2 W b / m 2

A long solenoid has 200 turns per cm and carries a current of 2.5 amps. The magn

Question

A long solenoid has 200 turns per cm and carries a current of 2.5 amps. The magnetic field at its centre is (

μ_{0} = 4 π \times 10^{- 7} w e b e r / a m p - m

)

Options:

A . 3.14×102 weber/m2

B . 6.28×10−2 weber/m2

C . 9.42×10−2 weber/m2

D . 12.56×10−2 weber/m2

Answer: Option B
:
B

B = μ_{0} n i = 4 π \times 10^{- 7} \times \frac{200}{10^{- 2}} \times 2.5 = 6.28 \times 10^{- 2} W b / m^{2}

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