Abattery, an inductor, a resistor, and a switch are wired in series. the battery produces an emf of 12.0 v and the inductor is rated at 25.0 mh. what size resistor should be used to yield 65% of the maximum current through the inductor when the switch has been closed for 0.35 s?

0.075 ohm

Explanation:

= maximum value of the current

= value of the current after time "t = 0.35 s" = 0.65

 = resistance of the resistor = ?

 = Inductance of the inductor = 25 mH = 0.025 H

= Time constant of the circuit

Current at any time is given as

sec

Time constant is given as

ohm

the part of the wave he is travelling on is the crest

so easy. just google the electromagnetic waves and it’ll pop up.