Magnetic Materials

1. A.
   $4 \times 10^{-6}$
2. B.
   $1 \times 10^{-3}$
3. C.
   $2 \times 10^{-4}$
4. D.
   $3 \times 10^{-5}$

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1. A.
   $\chi = \dfrac{\mu}{\mu_0} - 1$
2. B.
   $\chi = \dfrac{\mu_r}{\mu_0} + 1$
3. C.
   $\chi = \mu_r + 1$
4. D.
   $\chi = 1 - \dfrac{\mu}{\mu_0}$

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1. A.
   $\dfrac{N}{ML^3}$
2. B.
   $\dfrac{MN}{L^3}$
3. C.
   $\dfrac{M}{NL^3}$
4. D.
   $MNL^3$

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1. A.
   $120^\circ$
2. B.
   $60^\circ$
3. C.
   $180^\circ$
4. D.
   $90^\circ$

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1. A.
   $\dfrac{T_0}{3}$
2. B.
   $\dfrac{T_0}{\sqrt{3}}$
3. C.
   $3\,T_0$
4. D.
   $\sqrt{3}\,T_0$

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1. A.
   $\dfrac{B}{H} = \mu_0(1 + \chi)$
2. B.
   $BH = \mu_0(1 + \chi)$
3. C.
   $\dfrac{H}{B} = \mu_0(1 - \chi)$
4. D.
   $\dfrac{H}{B} = \mu_0(1 + \chi)$

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1. A.
   $5500 \times 10^{7}$
2. B.
   $5500 \times 10^{- 7}$
3. C.
   5500
4. D.
   5501

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1. A.
   It has low permeability
2. B.
   It has high coercivity
3. C.
   It has high retentivity
4. D.
   It has low retentivity

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1. A.
   $2.6 \times 10^{-5}$
2. B.
   $2.6 \times 10^{-4}$
3. C.
   $2.6 \times 10^{-3}$
4. D.
   $2.6 \times 10^{2}$

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1. A.
   $n/I$
2. B.
   $nI$
3. C.
   $\mu_0 I$
4. D.
   $\mu_0/nI$

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