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A ribbon of equal width and length l is ...

A ribbon of equal width and length l is wrapped around the curved surface of a right circular cylinder to cover it completely. If the base circumference of this cylinder is c, then how many times the ribbon was wrapped around the cylinder ?
एक समान चौड़ाई वाले किसी रिबन, जिसकी लम्बाई 1 है, को एक लम्ब वृत्तीय बेलन (सिलिंडर) के वक्र पृष्ठ (कवर्ड सरफेस ) पर पूर्ण रूप से कवर करने के लिए लपेटा जाता है |यदि बेलन (सिलिंडर) के आधार की परिधि c है, तो बेलन (सिलिंडर ) पर रिबन से कितनी बार लपेटा गया :

A

`l/(4c)`

B

`l/c`

C

`l/(2c)`

D

`(2l)/c`

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