please help with the questions in the picture. thank you ing the potential acros

Question

please help with the questions in the picture. thank you

ing the potential across a given capacitor causes the energy stored in that capacitor 13) to A) quadruple. C) reduce to one-fourth. B) double. D) reduce to one-half. 14) 14 R (XXY X and Y are two initially uncharged metal spheres on insulating stands, and they are in contact with each other. A positively charged rod R is brought close to X as shown in par (a) of the figure. Sphere Y is now moved away from X, as shown in part (b). What are the final charge states of X and Y? A) X is neutral and Y is positive. B) X is negative and Y is positive. C) Both X and Y are negative. D) Both X and Y are neutral. E) X is positive and Y is neutral. 1 plate capacitor the 15) capacitance increases by a factor of 4. What is the dielectric constant of the material introduced between the plates? A) 2 B) 0.4 C) 1/4 D) 4 E) None of the other choices is correct. 16) When the current through a resistor is increased by a factor of 4, the power dissipated by it 16) A) decreases by a factor of 4. B) increases by a factor of 16. C) remain unchanged. D) increases by a factor of 4. E) decreases by a factor of 16. 17) An electron traveling along the +x-axis enters an electric field that is directed vertically down, ie, 17) along the negative y-axis. What will be the direction of the electric force acting on the electron after entering the electric field? A) into the page B) to the right C) downward D) upward E) to the left

Explanation / Answer

15) C = kAeo / d

so capacitance is directly proportinal to the dielctric constant

so the dielectric constant in the above case is 4

so option D) 4 is the correct answer

16) P = I^2R

when I is increase by a factor of 4 , Power will be increased by a factor if 16

so option B) is the correct answer

17) The dorection will be to the left

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