First slide

Toroid

Question

A toroidal solenoid with 400 turns and mean radius of 4.0 cm has air core. The current in the winding that is required to set up a magnetic field of 4.0 m T in the air core is

Easy

A

0.5A
B

1.0 A
C

1.5 A
D

2.0 A

Solution

$\frac{1}{1600 \times 24} ≃ 26 μ A$
$μ_{o} \frac{N}{2 π r} i = B$
$2 \times 10^{- 7} \times \frac{400}{4 \times 10^{- 2}} \times i = 4 \times 10^{- 3}$
i = 2A

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