Thursday

April 17, 2014

April 17, 2014

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

**Related Questions**

physics - A coil with 150 turns , a radius of 5.0 cm , and a resistance of 12 ...

PHYSICS - A coil with 150 turns , a radius of 5.0 cm , and a resistance of 12 ...

physics - A coil with 210 turns, a radius of 5.2 cm, and a resistance of 11 ohms...

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 29.4 cm long solenoid 1.10 cm in diameter is to produce a field of 0...

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

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

Physics - A 550 turn solenoid is 15 cm long. The current in it is 33 A. A 3.0 cm...