The average radius of an air cored toroid is 0.1 m and it has 500 turns. If it carries 0.5 ampere current, then the magnetic field inside it is :

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5 x 10-4 tesla

5 x10-3 tesla

5 x10-2 tesla

2 x10-3 tesla

answer is A.

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Detailed Solution

magnetic field due to a toroidμ0NI2πR where N is the total no of turns and R is the mean radius B=4π x10-7500 x0.52π0.1=5 x 10-4

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