A series RL circuit includes a 2.55 V 2.55 V battery, a resistance of R = 0.555 Ω , R=0.555 Ω, and an inductance of L = 2.21 H. L=2.21 H. What is the induced emf 1.73 s 1.73 s after the circuit has been closed?

i had this question and the answer was 3.15 miles.

martina travels from school to her mom's office. from there, she walks to school. after school, she walks to the library and then to a friends house before finally ending back at home. find martina's total distance traveled.

a) 0 miles  

b) 0.4 miles  

c) 1 mile  

d) 3.15 miles

t = 1/400 h   ⇔ 0.0025 h ⇔ 9s ⇔ 0.15 m

any of the answers are correct.