Interested to Buy Any Domain ? << Click Here >> for more details...
a solenoid of inductance 250mH and resistance 10ohm is
connected to a battery. the time taken for the magnetic energy
to reach 1/4th of its maximum value will be?
- 1 Answers
- 5742 Views
- SSC, I also Faced
- E-Mail Answers
Answer Posted / 7anoter4
Magnetic energy is W=B*H =miuo*H^2=K*i^2
Wmax=K*Imax^2 ¼*Wmax=K*Imax^2/4 i=Imax/2
The current equation it is: i=Imax*[1-e^(-t*L/R)] . If
i=1/2*Imax then : e^(-t*L/R)=1/2 and t=-LN(1/2)*R/L R=10
ohm L=0.250 H t=27.73 sec.
| Is This Answer Correct ? | 0 Yes | 3 No |
Post New Answer View All Answers
what is POTT and PUTT explain?
Which cable is use for rtcc control panel
what is earth fault relay 64T, why it is used in main Incomer and neutral CT of Transformer.
what is the size of ht cable of 33kv ht line and transformers ratings are 1 Mva and 5mva.please send formula also.
what is negative and zero impedance in 3 phase induction motor ??
why ht cable end termination don't have a gland?
How does the slip regulator works as a startor
How to decide whether A / B / C / D curve type MCB should be used?
What is the ideal position cooling fan inside the dc motor?
why we can use 1 to 5V dc
What is the maximum percentage voltage drop (vd%)for a motor control center
What should be the magnetic balance test values for a 3 phase delta/star connected single primary dual secondary winding transformer (90 MVA / 2 X 45 MVA TRANSFORMER)
why we use circuit breakers for switching instead of normal switching device?
Differentiate between voltage and current feedback in amplifiers?
is there any device that works properly accept relay, it may be fuse but if i want fuse of 33kv 300 amp it is avaliable, pls give me details
