In some situations we must use the 'retarded' potentials to compute electromagneticfields. Which two of the following statements about the retarded potentials arecorrect?14Select one or more:O a. They reflect the finite time taken for a change in source (charge/current) to produce achange in field some distance awayO b. They must be used when charges and/or currents are time-variable.O c. They must be used for any problem involving currentsO d. They are not valid when charges and/or currents are time-variable

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/hich two of the following statements about the retarded potentials t? are

Inquiry into Physics

8th Edition

ISBN:9781337515863

Author:Ostdiek

Publisher:Ostdiek

Chapter8: Electromagnetism And Em Waves

Section: Chapter Questions

Problem 34Q

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Question

In some situations we must use the 'retarded' potentials to compute electromagnetic
fields. Which two of the following statements about the retarded potentials are
correct?
14
Select one or more:
O a. They reflect the finite time taken for a change in source (charge/current) to produce a
change in field some distance away
O b. They must be used when charges and/or currents are time-variable.
O c. They must be used for any problem involving currents
O d. They are not valid when charges and/or currents are time-variable

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