Question

Multiple choice questions: 6) A toroid has inner radius 7 cm and outer radius 8 cm. It is wound with 1500 turns of wire and carries a current of 5 A. The magnetic induction at the central radius of the toroid is а) 10 mT b) 20 mm c) 10 ml d) 20 mm​

Answer 1

Explanation:

answer a)10mt ahe ka te sanga

Answer 2

b) 20 mm

Magnetic induction:

Given,

Inner radius (r₁) = 7 cm = 0.07m

Outer radius (r₂) = 8 cm = 0.08m

Turns (n) = 1500

The magnetic induction at the central radius of the toroid can be found by the relation:

B = μ₀nI/l         (where l is the length of torroid)

where, l = 2π(r₁ + r₂)/2

l = 0.15π

B = $\frac{4\pi *10^{-1} * 1500*5}{0.15\pi }$

B = 20 mm

Hence, the magnetic induction at the central radius of the toroid is 20 mm.