Concept explainers
(a)
The direction of the force on a negatively charged particle.
(a)
Answer to Problem 61A
Upwards
Explanation of Solution
Given:
Electric field strength,
Formula Used:
Electric field strength can be obtained by:
Here, F is the electrostatic force and q is the test charge.
The direction of electric field is along the direction of the force for the positive test charge and opposite for the negative test charge.
Calculation:
For a negatively charge particle, the direction of the electrostatic force would be opposite the direction of the electric field. Thus, it will be upwards.
Conclusion:
The direction of force on a negatively charged particle would be opposite to the direction of the electric field.
(b)
The electric force on an electron in the given field.
(b)
Answer to Problem 61A
Explanation of Solution
Given:
Electric field strength,
Charge on an electron,
Formula Used:
Electrostaticforceon a charge particle can be obtained by:
Here, E is the strength of theelectricfield and q is the test charge.
The direction of electric field is along the direction of the force for the positive test charge and opposite for the negative test charge.
Calculation:
Substitute the values and solve:
Conclusion:
The electric force on an electron is
(c)
To Compare: The strength of electric force on an electron with the force of gravity on it.
(c)
Explanation of Solution
Given:
The electric force on an electron is
Mass of an electron,
Formula Used:
The force of gravity on the electron can be obtained by:
Here, g is the acceleration due to gravity.
Calculation:
Substitute the values and solve:
Conclusion:
The force of gravity is very less than the electric force on an electron.
Chapter 21 Solutions
Glencoe Physics: Principles and Problems, Student Edition
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