Sunday

February 1, 2015

February 1, 2015

Posted by **Lily** on Monday, March 8, 2010 at 3:33am.

I used R=(p*l)/A and solved for l. I got the answer wrong. For the area I used 0.03*0.03 as the cross sectional area. What did I do wrong?

- Physics -
**drwls**, Monday, March 8, 2010 at 7:42amThe area is 0.03 * d, and you are supposed to solve for d, knowing the total resistance. Current flow is along the length, which you know to be 3.1 cm.

There is possibly another problem as well. The resistivity of gold is approximately 2.44 × 10-8 ohm-m. The way you are using it, with gold block dimensions in cm, you have to change the value of p to 2.44 × 10-6 ohm-cm

- Physics -
**Lily**, Monday, March 8, 2010 at 2:25pmThank you.

**Answer this Question**

**Related Questions**

physics - A rectangular piece of gold is 2.6 cm long and 3.9 cm wide.The piece ...

physics - A rectangular piece of gold is 2.5 cm long and 2.6 cm wide. How deep ...

Physics - A rectangular piece of gold is 3.8 cm long and 2.5 cm wide. How deep ...

PHYSICS - A rectangular piece of gold is 3.6 cm long and 3.5 cm wide. How deep ...

Physics - Can the following equation be used to solve the question? R = ρ L...

Algebra - The purity of gold is measured in karats. Twenty-four karat gold is ...

Algebra 2 - The purity of gold is measured in karats. Twenty-four karat gold is ...

physics - a piece of gold aluminuim alloy weighs 100g in air and 80g in water....

geometry - how many inches long is the radius of the largest circle that can fit...

science - Pure gold has a density of 19.32 g/cm3. How large would a piece of ...