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. Marks = 5
Ans.
Yes, It is valid. If he engaged the reference
potential at a higher point and others lower, then the potential difference is
negative.
Example:
The reference potential is 5V and the other
is 3V then the potential difference is -2V.
Question # 2
Determine the magnitude as well as the direction of the electric field at point A, shown in the above figure. Given the value of k = 8.99 × 1012N/C.
Explanation of Direction:
The direction of “E” depends on the nature of the Test charge (Positive and Negative).
In negative Test charge, E is opposite to F, and position
is the same as F.
Question # 3
In the figure shown, the lamp cord is 85cm long and
comprises cupper wire. Calculate the wire‘s resistance? The use value of resistivity for Cu as 1.75 × 10-8Ωm
Answer:
Explanation of Direction:
The direction of “E” depends on the nature of the Test charge (Positive and Negative). In negative Test charge, E is opposite to F, and position is the same as F.
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