9. Rank the value of electrical potential (i e. voltage) at the four points (a,

Question

9. Rank the value of electrical potential (i e. voltage) at the four points (a, b, c, and d) from highest to lowest. (Assume the electron is not present.) A) V(a) V (b) V(c) V(d) D) V(a) V(c) V(b) V(d) The cathode-ray tube shown at right is used to accelerate charged ions. The device consists of two 8 cm parallel plates of very large area separated by an 8 cm gap. The plate on the left is connected to ground, Ions while the plate on the right is set to a potential of +7 kv. ion of mass m and charge q are produced (at rest) at the Source cathode plate. They accelerate across the gap, and emerge with final speed v through a hole in the anode plate. +7 kV 4. Are the ions positively or negatively chirged? They actele through ine positive gap a. Positively charged. Negatively charged, 5. Calculate the final speed vachieved by ions of mass m 2.7 x 10 kg and charge magnitude lal 3.2 x 10" C. mass 2.7 ylo 36 he a. V 2.09x103 m/s g 3. vio V- 7.36x10 mis c, v 1.42x10 m/s v 8.15x10" m/s e. van 4.07x10 m/s

Explanation / Answer

The data of problem 3 is not present in the page, it may be present in previous pages of question paper with problem 1 or 2. However data for question 4 and 5 are present (same data is for both 4 and 5). So I am doing question 5

5. increase in kinetic energy = decrease in potential energy

0.5mv2 -0 = 0 - qV

0.5*2.7*10-26 kg*v2 = - -3.2*10-19 C*7000 V

v2 =3.2*10-19 *7000 /[0.5*2.7*10-26] =1.659 * 1011

v = 407340 m/s = 4.07 x 105 m/s

hence d option is correct

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