## Potential, E = – dV/dr, Electric Lines and Work done- MCQ-Basic

Physics is an important subject in preparation for various Competitive exams. To keep a track of your preparation we have designed a small quiz of 10 Basic Level Questions on Potential, E = – dV/dr, Electric Lines and Work done.You have 10 minutes to solve the quiz, click the start timer button in order to start the timer and then click on submit button at the end to submit the quiz and view your scores and correct answers.

Q1. A thin spherical conducting shell of radius R has a charge q. Another charge Q is placed at the centre of the shell. The electrostatic potential at a point P a distance R/2 from the centre of the shell is

•  (q+Q)2/4πεoR
•  2Q/4πεoR
•  2Q/4πεoR - 2q/4πεoR
•  2Q/4πεoR + 2q/4πεoR

2Q/4πεoR + 2q/4πεoR

Q2. A charged oil drop is to be held stationary between two plates separated by a distance of 25mm . If the mass of the drop is 5 X 10-15 kg and the charge on it is 10-18 C, the potential to be applied between the two plates is ( g = ms-2 )

•  125 V
•  1250 V
•  2500 V
•  450 V

1250 V

Q3. A hollow conducting sphere of radius R has a charge (+Q) on its surface. What is the electric potential within the sphere at a distance r=R/3 from its centre

•  Zero
•  Q/4πεor
•  Q/4πεoR
•  Q/4πεor2

Q/4πεoR

Q4. Two spheres A and B of radius ‘a’ and ‘b’ respectively are at same electric potential. The ratio of the surface charge densities of A and B is

•  a/b
•  b/a
•  a2/b2
•  b2/a2

b/a

Q5. The radius of a soap bubble whose potential is 16 V is doubled. The new potential of the bubble will be

•  2 V
•  4 V
•  8 V
•  16 V

8 V

Q6. A unit charge is taken from one point to another over an equipotential surface. Work done in this process will be

•  Zero
•  Positive
•  Negative
•  Optimum

Zero

Q7. A hollow metal sphere of radius 5 cm is charged such that the potential on its surface is 10 V. The potential at a distance of 2 cm from the centre of the sphere

•  Zero
•  10 V
•  4 V
•  10/3 V

10 V

Q8. At a certain distance from a point charge the electric field is 500 V/m and the potential is 3000 V. What is this distance

•  6 m
•  12 m
•  36 m
•  144 m

6 m

Q9. Two plates are 2 cm apart, a potential difference of 10 volt is applied between them, the electric field between the plates is

•  20 N/C
•  500 N/C
•  5 N/C
•  250 N/C

500 N/C

Q10. Three charges 2q, – q, – q are located at the vertices of an equilateral triangle. At the centre of the triangle

•  The field is zero but potential is non-zero
•  The field is non-zero but potential is zero
•  Both field and potential are zero
•  Both field and potential are non-zero

The field is non-zero but potential is zero

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