Pls solve this question...

Dear student,

S e l f i n d u c \tan c e = μ_{0} n^{2} A L = μ_{0} n^{2} L \times 2 π r (r + h) n = T o t a l n u m b e r o f t u r n s / l e n g t h L = L e n g t h o f i n d u c t o r r = r a d i u s o f c y l i n d e r c r o s s s e c t i o n h = h e i g h t o f c y l i n d e r c r o s s - s e c t i o n S o, w h e n a l l l i n e a r d i m e n s i o n s a r e i n c r e a s e d b y a f a c t o r o f 2 . M e a n s r, h a n d L a r e m a d e t w i c e o f o r i g i n a l T h e n e w s e l f i n d u c \tan c e b e c o m e s I' = 8 I .

Regards