To Explain: The method of detection of a field at a point, determination of magnitude of the field, and how to choose the magnitude of the test charge.
Explanation of Solution
Introduction:
Electric field is a physical quantity that gives relationship between the force exerted on a test charge and the size of a test charge. It is a vector quantity. If
This expression clearly indicates that the electric field on a charge is independent of its size.
To detect the field at a point − If the test charge placed at that point experiences a force then one can say that there exist a field at that point, because any charge experiences a force of attraction or repulsion from the electric field.
To determine the magnitude of the filed
To choose the magnitude of the test charge − The test charge must be chosen in such a way that its magnitude must be very small compared to that of the charges producing the field. Because the test charge also interacts with other charges and this interaction should be small for precise measurement.
Chapter 21 Solutions
Glencoe Physics: Principles and Problems, Student Edition
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