COnfused about number 4 and 6 upl Choice -You do not need to show your work -No

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COnfused about number 4 and 6

upl Choice -You do not need to show your work -No partial credit Circle the correct answer(s) . Phys 260 Exam Il-A Slow dl 4. The figure o the drift velocity of the moving charges as they go from region A to region B and then to region C? (a) The velocity increases from A to B and decreases from B to C. (b) The velocity remains constant. c) The velocity decreases from A to B and increases from B to C (d) The velocity increases all the time. (e) The velocity decreases all the time. 5. For an electron moving in a direction opposite to the electric field (a) its potential energy increases and its electric potential increases. (b) its potential energy decreases and its electric potential decreases. (o) both its potential energy and it electric potential remain constant. (d) its potential energy decreases and its electric potential increases. (e) its potential energy increases and its electric potential decreases. 6. Which of the following cylindrical wires has the largest resistance? All wires are made of the same material (a) a wire of length L and diameter d (b) a wire of length L/2 and diameter d (c) a wire of length L and diameter 2d day a wire of length L and diameter d/2 (e) a wire of length L/2 and diameter 2d

Explanation / Answer

4 a)

reason :the area A of cross-section decreases from A to B and then increase

we know that , Vd is inversly related to area of cross-section A, hence as the area decrease, the drift velocity increase from A to B and then decrease

6 d)

resistance is given as

R = pL/A where p = resistivity , L = length , A = area of cross-section

R = pL/(pi d2/4)

R = 4 pL/(pi d2)

resistance will be maximum when L is maximum and "d" is minimum

which is the case in option "D"

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