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Engineering Physics by S. Mani Naidu

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Solved Problems

1.     The magnetic susceptibility of silicon is0.4 × 10−5. Calculate the flux density and magnetic moment per unit volume when magnetic field of intensity 5 × 105 A/m is applied.

sol: Given: χ = –0.4 × 10‒5

H = 5 × 105 A /m

B = ? and M = ?

B = μ0(H + M) = μ0 H(1 + χ)

    = 4π × 10‒7 × 5 × 105 [1 – 0.4 × 10‒5] = 4π × 5 × 10‒2 × 0.9996 = 0.62 Wb/m2

M = χH = –0.4 × 10–5 × 5 × 105 = –2.0 A/m.

2.     The magnetic field strength in silicon is 1000 A/m. If the magnetic susceptibility is0.25 × 10−5, calculate the magnetization and flux density in silicon.

sol: Magnetic field strength (H) = 1000 A/m

Magnetic susceptibility (χ) = –0.25 × 10‒5

Magnetization (M) = χH = –0.25 × 10‒5 × 1000 = –0.25 × 10‒2 A/m.

Magnetic flux density ( ...

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