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April 18, 2015

April 18, 2015

Posted by **smiley** on Tuesday, October 16, 2012 at 8:10pm.

10

⁄ )r

2

,

where r is the radial distance out to the wire’s radius of 3.00 mm. The potential applied to

the wire (end to end) is 60.0 V. How much energy is converted to thermal energy in

2.00 h?

- physics -
**Elena**, Wednesday, October 17, 2012 at 5:31amk=2.75•10¹º A/m⁴ R=0.003 m

i=∫JdA=∫k•r²•2•π•r•dr= k•π•R²/2 =3.5 A

The rate of thermal energy generation is P=i•V=3.5•60=210 W.

Assuming a steady rate, the thermal energy generated in 2h=7200 s is

Q=P •Δt=210•7200= 1.5112 •10⁶ J

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