First slide

Toroid

Question

A toroid has a core of inner radius 25 cm and outer radius 26 cm around which 3500 turns of wire are wound. If the current in the wire is 11 A the magnetic induction out side the toroid in tesla.

Easy

A

Zero
B

$3 \times 10^{- 2}$
C

$3 \times 10^{- 3}$
D

$3 \times 10^{- 4}$

Solution

As the magnetic field due to a toroid is concentric to it and vanishes rapidly just outside the toroid, so, outside the toroid, magnetic field will be zero

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