Formula for a solenoid's self-inductance and what it depends on

1. A.
   decreasing its length
2. B.
   increasing its area of cross-section
3. C.
   increasing the current through it
4. D.
   increasing the number of turns in it

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1. A.
   directly proportional to current flowing through the coil.
2. B.
   directly proportional to the length.
3. C.
   directly proportional to its area of cross-section.
4. D.
   inversely proportional to the area of cross-section.

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1. A.
   both l and A increase.
2. B.
   l decreases and A increases.
3. C.
   l increases and A decreases.
4. D.
   both l and A decrease.

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1. A.
   $\mu_0\pi\left(\frac{nd}{2}\right)^2$
2. B.
   $4\mu_0\pi\left(\frac{nd}{2}\right)$
3. C.
   $\frac{\mu_0\pi nd}{2}$
4. D.
   $\frac{4\mu_0\pi}{n^2d^2}$

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1. A.
   $L = N\phi$
2. B.
   $L = \mu_0 N A l$
3. C.
   $L = \mu_0 N^2 \frac{A}{l}$
4. D.
   $L = \mu_0 N \frac{A}{l}$

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1. A.
   $4$ mH
2. B.
   $4$ H
3. C.
   $40$ H
4. D.
   $0.4$ H

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1. A.
   its length
2. B.
   the number of turns
3. C.
   the resistance of coil
4. D.
   the square of the number of turns

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