1. What is the approximate magnitude of the magnetic field at a separation of 10 nm from an electron? (You may assume the electron's spin is aligned to the direction of separation)

2. A circuit contains a Resistor R and an Inductor L in parallel, the current through them is initially I (but there are no other sources of current). What is the magnetic field energy stored in the Inductor at a time t=L/R later? 

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The magnetic field due to a moving charge can also be determined usin... View the full answer