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Example 12.6 Awire of given material having length land area of cross-section Ahas a resistance of 4 12. What would be the resistance of another wireof the same material having length 1/2 and area of cross-section 2A? |
| Answer» L1= la1=ar1= 412rho1=rho2l2=1/2a2=2alet R2 be xr1=l1/a1412= L /anowr2=l2/a2r2=1/2l/2ar2 = 1/4 ×l/aand l/a= 412so r2=1/4×412r2=103 | |