Wednesday

April 1, 2015

April 1, 2015

Posted by **Spencer** on Monday, April 7, 2008 at 4:51pm.

Find the value of I_coil, the induced current in the coil at time t= 1.85 seconds?

I tried plugging into solenoid equation getting field then using that field to find induced current but am not getting it.

- physics EM -
**bobpursley**, Monday, April 7, 2008 at 9:22pmwhat did you plug into the solenoid equation? What did you take as dB/dt?

Let me see you work, I suspect the error is in the detail.

- physics EM -
**Spencer**, Monday, April 7, 2008 at 9:50pmok for dB/Dt I get .18025cos(2pift). for induced emf its Area*dB/dt*N(turns). ive tried it with a problem I know and it works fine. at the end do i just plug in the given t into the equation. Please could you work it out i think its calculation but i cant find it. I use B=(u*N*Isol)/L this gives magnetic field for solenoid. B= (4pie-7*170*.470*sin(2pift)/.21

this gives 4.781e-4*sin(2pift)

dB/dT is .18025 cos(2pift).

the area in the calculation is the area between the solenoid and coil. so its pi*((.041/20)^2-(.017/2)^2)=area. so this area times the dB/dT times number of turns 59 should equal induced emf . then that divided by resistance should be it. could you work it out and tell me what you get. I keep getting 20.3 mA

**Answer this Question**

**Related Questions**

Physics - A cirular coil of 19 turns and radius 10.2cm surrounds a long solenoid...

Physics - A cirular coil of 27 turns and radius 15.0cm surrounds a long solenoid...

tough physics question - A 500 turn solenoid with a length of 20 cm and a radius...

physics induced voltage - A 500 turn solenoid with a length of 20 cm and a ...

physics induced voltage - A 500 turn solenoid with a length of 20 cm and a ...

physics - A solenoid has a cross-sectional area of 2.60 10-4 m2, consists of ...

physics - A solenoid has a cross-sectional area of 2.60 10-4 m2, consists of ...

physics - A solenoid has a cross-sectional area of 2.60 10-4 m2, consists of ...

Physics - A long solenoid has 1400 turns per meter of length, and it carries a ...

physics - Hi! could anyone help me with this question please, I really don't ...