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area increases when conductor moves right bc more area in the circuit
when wire is pulled away, the "d" in the magnetic strength formula increases, so b is decreasing
In that one problem, induced current cannot interact the induced magnetic field, it needs to interact w/ the already est field
Solenoids are gonna go L to R or R to L; to figure out the direction of the current, look at how RHR would affect magnetic field direction behind that wire (does it make it go R or L?)
For Part D of that problem, the way you can tell the direction of the magnetic field is by looking at the charge distribution in the bar. There has to a be a magnetic force upwards to polarize the - charges downwards. Therefore magnetic field is in into the page
For self-inductance formula, the induced current opposing is only present for a very brief time as this is when magnetic flux changes
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