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Physics Past Questions and Answers

Topic: Coulomb's inverse square law, electric field and potential

Jamb Physics Questions - Coulomb's inverse square law, electric field and potential

Question 1:
If NEPA charges 5k per kWhr, what is the cost of operating for 24 hours a lamp required 1A on a 200v line?
  • A 24k
  • B 55k
  • C 40k
  • D 26k
  • E 32k
View Answer & Explanation
Question 2:
Why is it impossible for the lines of force of an electric field to cross one another?
  • A Like charges repel each other
  • B A charged particle is deflected by an eletric field
  • C Like charges are arranged on the same line of force
  • D A positively charged particle can travel in only one direction at any time
  • E None of these is correct
View Answer & Explanation
Question 3:
Find the work done in moving a 2 C charge between two points X and Y in an electric field if the potential difference is 100 volts
  • A 50J
  • B 100J
  • C 200J
  • D 400J
View Answer & Explanation
Question 4:
A student is at a height 4m above the ground during a thunderstorm. Give that the potential difference between the thundercloud and the ground is 107v, the electric field created by the storm is
  • A 2.0 * 10<sup style='font-size: smaller;'>6</sup> NC <sup style='font-size: smaller;'>-1</sup>
  • B 2. 5 * 10<sup style='font-size: smaller;'>6</sup> NC <sup style='font-size: smaller;'>-1</sup>
  • C 1.0 * 10<sup style='font-size: smaller;'>7</sup> NC <sup style='font-size: smaller;'>-1</sup>
  • D 4.0 * 10<sup style='font-size: smaller;'>7</sup> NC <sup style='font-size: smaller;'>-1</sup>
View Answer & Explanation
Question 5:
The electric field between two - point charges is shown in the diagram above. What types of charges are at X and Y?
  • A Both X and Y are negative
  • B Both X and Y are positive
  • C X is positive and Y is negative
  • D X is negative and Y is positive
View Answer & Explanation