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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 6:
The correct expression for the potential at a point distance r from a charge q in an electric field is
  • A <table class='tbn'><tbody><tr>_q<sup style='font-size: smaller;'>2</sup> </td></tr><tr><td> 4πε<sub style='font-size: smaller;'>o</sub>r<sup style='font-size: smaller;'>2</sup> </td></tr></tbody></table>
  • B <table class='tbn'><tbody><tr>_q<sup style='font-size: smaller;'>2</sup> </td></tr><tr><td> 4πε<sub style='font-size: smaller;'>o</sub>r </td></tr></tbody></table>
  • C <table class='tbn'><tbody><tr>_q </td></tr><tr><td> 4πε<sub style='font-size: smaller;'>o</sub>r<sup style='font-size: smaller;'>2</sup> </td></tr></tbody></table>
  • D <table class='tbn'><tbody><tr>_q </td></tr><tr><td> 4πε<sub style='font-size: smaller;'>o</sub>r </td></tr></tbody></table>
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Question 7:
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>
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