Increase in the magnetic field when a solenoid or toroid is filled with a magnetic material

1. A.
   $1.2 \times 10^{- 5}$
2. B.
   $1.2 \times 10^{- 3}$
3. C.
   $1.8 \times 10^{- 3}$
4. D.
   $2.4 \times 10^{- 5}$

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1. A.
   $2\%$
2. B.
   $0.2\%$
3. C.
   $0.1\%$
4. D.
   $1\%$

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

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