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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > (a) Estimate the average drift speed of conduction electrons in a copper wire of cross sectional area 1.0×10−7m2 carrying a current of 1.5 A. Assume that each copper atom contributes roughly one conduction electron. The density of copper is 9.0×103kgm−3 and its atomic mass is 63.5u. (b) Compare the drift speed obtained with the speed of propagation of electric field along the conductor, which causes the drift motion.

(a) Estimate the average drift speed of conduction electrons in a copper wire of cross sectional area 1.0×10−7m2 carrying a current of 1.5 A. Assume that each copper atom contributes roughly one conduction electron. The density of copper is 9.0×103kgm−3 and its atomic mass is 63.5u. (b) Compare the drift speed obtained with the speed of propagation of electric field along the conductor, which causes the drift motion.

A voltage of 30 V is applied across a colour coded carbon resistor with first black and yellow colours. What is the current flowing through the resistor ? second and third rings of blue