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[" 26.Mean radius of a toroid is "10cm" ...

[" 26.Mean radius of a toroid is "10cm" and number "r" it "],[" of turns are "500" .If current flowing through it "],[" is "0.1" ampere then value of magnetic field (in tesla) "],[" for toroid: "],[[" (1) "10^(-2)," (2) "10^(-5)],[" (3) "10^(-3)," (4) "10^(-4)]]

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