Concept explainers
Number of excess electrons does the drop have?
Answer to Problem 3P
Solution:
The number of excess electron on the oil drop is .
Explanation of Solution
Given:
Mass of the oil drop,
Distance between the plates,
Potential difference between the plates,
Formula used:
The weight of the oil drop is given as
Here,
is the mass
is the acceleration due to gravity
The electric force on the drop is calculated as
Here,
is the charge of the oil
is the electric field
Number of excess electron on the oil drop is calculated as
Here,
is the number of excess electron
is the charge of the electron
Calculation:
The electric field is calculated as
Plugging the values in the above equation
Since, the oil drop is held at rest; therefore, the electric force and force due to gravity on the drop must be equal
Plugging the values in the above equation
Number of excess electron on the oil drop is calculated as
Plugging the values in the above equation
Chapter 27 Solutions
Physics: Principles with Applications
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