Help with resistivity and conductivity!?

Posted on 2016-05-11 17:59:00 in Physics by JAMPA

keep getting the wrong answers for these questions, 

can anyone show me how to work out the following 

1. A piece of metal wire, with a cross-sectional area of 3 x 10^-9 m^2 and length 0.1 m , has a resistivity of 3 x 10^-8 Ωm. What is the resistance of the material? (LEAVE OUT units of Ω) 

2. What is the conductivity of the wire (LEAVE OUT UNITS and give answer in the form 4E07 for 4000000)? 

3. What is the total resistance of two 100Ω resistors connected in parallel (LEAVE OUT UNITS OF Ω)? 

4. What voltage drop would be measured across the length of a 0.1m conductor if the uniform electric field in the conductor is 5V/m (LEAVE OUT UNITS OF V) ? 

5. If the conductivity, σ , of the conductor is 4x10^7 Ω^-1m^-1 , what is the current density j (LEAVE OUT UNITS and put answer in the form 4E06 for 4,000,000)?

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