A conductor of radius r, length 
and resistivity ρ has resistance R. What is the new resistance if it is stretched to 4 times its original length?
Definitions:
Retained Earnings
The portion of net income that is retained by a company rather than distributed to its shareholders as dividends.
Coupon Rate
The interest rate on a bond which the issuer pays to the bondholders, generally fixed and paid at specific intervals.
Yield to Maturity
The total anticipated return on a bond if held to its maturity date, including all interest payments and capital gains or losses.
Required Rate of Return
The minimum return an investor expects to achieve by investing in a particular asset, taking into account the risk level of the investment.
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