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EXPLAIN?????

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Answer 1

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✍L/2

There is an mistaken in ur options. Kindly recheck the answers from Faculty.

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EXPLANATION —

L is inductance of solinoid

initially L of solinoid we know that

⇒$L = \frac{u0 \: {N}^{2} \: \pi \: {r}^{2} }{l}$

___________(1)

Now the changed

r------> r/2

l -----> l/2

Therefore

⇒$Lnew = \frac{u0 \: {N}^{2} \: \pi \: (\frac{r}{2})^{2} }{ \frac{l}{2} }$

On solving and putting (1)

⇒$Lnew = \frac{L}{2}$

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Answer 2

Answer:

Heya ............☄️☄️☄️

Correct answer is - option (A) 2L

refer to the attachment for required solution .........✔️✔️✔️