Self induction of a solenoid is: (1) inversely proportional to area of cross-section \( \mathrm{...

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Self induction of a solenoid is:
(1) inversely proportional to area of cross-section
\( \mathrm{P} \)
(2) directly proportional to area of cross-section
W
(3) directly proportional to its length
(4) directly proportional to current flowing through the coil
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