A fuse wire is made of an alloy of tin and lead because it has
A. Low melting point and low resistance
B. High melting point and low resistance
C. Low melting point and high resistance
D. High melting point and high resistance
Answer: Option C
Solution (By JKSSB Mock Tests)
Fuse needs low melting point to melt at overload, high resistance to generate more heat (I²R). Tin-lead alloy suitable. Copper high melting point, not fuse material.
Explanation:
For spherical mirrors, R = 2f. So R = 2 × 15 = 30 cm. Sign convention: for concave mirror, f and R are negative by Cartesian convention, but magnitude 30 cm. So 30 cm is correct.
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