To what value would you have to raise the temperature of a copper wire (originally at 20 ∘C) to increase its resistance by 17 % ?

The temperature is  

Explanation:

Generally the equation that represents the variation of resistance with respect to temperature is mathematically  represented as      

=>  

Here   is the original  temperature with value    

      is the initial resistance of the copper

         R is the resistance at  temperature

is the temperature coefficient of resistivity with a value  

From the question we are told that  

So

Hence

=>    

=>  

=>  

so easy. just google the electromagnetic waves and it’ll pop up.