Answer:
C. 80 J
Explanation:
dU = dq + w
dU = -20 J + (-60 J) = -80 J
Measurements of the Earths magnetic field has been recorded since 1829
Answer:
The strength of the source charge's electric field could be measured by any other charge placed somewhere in its surroundings. The charge that is used to measure the electric field strength is referred to as a test charge since it is used to test the field strength. The test charge has a quantity of charge denoted by the symbol q.
Explanation:
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