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35. If water rises in a capillary tube upto 3 cm. What is

the diameter of capillary tube (Surface tension of water = 7.2 ×10–2 N/m) 

(a)  9.6×10–4 m

(b)  9.6×10–3 m

(c)  9.6×10–2 m

(d)  9.6×10–1 m

Ans. a

(56)

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