c). A metallic wire carries a current of 1.67 A and has a resistance of 1.80 O.

Question

c). A metallic wire carries a current of 1.67 A and has a resistance of 1.80 O. How long is the wire if the magnitude of its electric field is lEl = 3.60 x 10-2 V/m?

Express the result in the unit [m] and to three significant figures. If you must use scientific notation, please enter as follows: e.g. 0.000123 = 1.23E-4. Only answer in numerical values, no units. For negative numbers, leave no space between the negative sign and the number: e.g. right: -1.00, wrong: - 1.00.

d).459 C pass through a 15.2 O resistor in t = 1.85 minutes. What is the potential along the resistor?

Express the result in the unit [V] and to three significant figures. If you must use scientific notation, please enter as follows: e.g. 0.000123 = 1.23E-4. Only answer in numerical values, no units. For negative numbers, leave no space between the negative sign and the number: e.g. right: -1.00, wrong: - 1.00.

Explanation / Answer

a .

V = ir = 1.67 * 1.8 = 3.006 ;

V = Ed ;

d = V / E = 3.006 / ( 3.6 e -2 ) = 83.5 m

b .

i = q /t = 0.459 / ( 1.85 * 60 ) = 4.135 e -3 ;

V = i r = 4.135 e - 3   * 15.2   = 0.0628 V

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