PHY101 Assignment 1 Solution Spring 2021

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PHY101 ASSIGNMENT 1 SOLUTION SPRING 2021 

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Question 1:

The student of Physics claims that he has calculated a negative potential difference between two points. Is it true or wrong? Either yes or no explain it by giving a suitable example. 

Solution: 


It is true. If he took the reference potential at a higher point and the other at a lower then the potential difference is negative. 

Example.

The reference potential is 5v and the other is 3 V then the potential difference is – 2V.


Question 2:

Determine the magnitude as well as direction of the electric field at point A, shown in the above figure. Given the value of k = 8.99 × 1012N/C. 

Solution:  


   


Question 3:

In the figure shown, the lamp cord is 85cm long and comprises copper wire. Calculate the wire‘s resistance? Use a value of resistivity for Cu as 1.75 × 10-8Ωm.


Solution:





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