The curved surface of a cylinder is 1000 cm2 .A wire of diameters 5 mm. is wound around it ,so as to cover it completely .What is the length of the wire used? एक बेलन का वक्रपृष्ठ 1000 सेमी2 है। एक 5 मिमी. व्यास वाले तार को इसके चारों ओर लपेटा जाता है। जिसमें यह इसकी पूरी तरीके से ढ़क ले। प्रयोग हुये तार की लम्बाई क्या है?

Cylinder curved surface area = 2πrh = 1000 cm². Wire diameter = 5mm = 0.5cm, so circumference of each turn = πd = 0.5π cm. Length of wire = CSA / wire diameter = 1000 / 0.5 = 2000 cm = 20m. The wire winds around the cylinder with its diameter as the effective spacing. Option A (22m), C (18m), and D (34m) are incorrect calculations.