Homework Help: physics

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

The current-density magnitude in a certain circular wire is J = (2.75 × 10
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 5:31am
k=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

Answer this Question

Related Questions

physics - The current-density magnitude in a certain cicular wire is J= (2.75*10...
physics - A copper wire has a circular cross section with a radius of 3.75 mm. ...
physics - A copper wire has a circular cross section with a radius of 3.75 mm. ...
Physics - Would someone check this please? A circular loop of wire of radius 0....
Physics - Would someone check this please? A circular loop of wire of radius 0....
Physics - Would someone check this please? A circular loop of wire of radius 0....
College Physics - How do I solve this problem: A particular wire has a current ...
physics - How far from a straight wire with a current of 5 A is a second, ...
Physics - A long, straight wire carries a current of 48 A. The magnetic field ...
physics - an insulated circular ring of diameter 6.50cm carries a 12.0 A current...

For Further Reading

First Name:
School Subject:
Answer: