Question

which of the following has smallest resistivity silver or nickel or copper or iron​

Answer 1

Answer:-

Before going to answer this question , let's know about the resistivity of given metal & alloy.

Material⠀⠀⠀⠀⠀⠀⠀⠀Resistivity ( ohm metre)

• Silver ⠀⠀⠀⠀⠀⠀⠀⠀ 1.60 ×10^-8

• Copper ⠀⠀⠀⠀⠀⠀⠀1.62 × 10^-8

• Nickel ⠀⠀⠀⠀⠀⠀⠀⠀6.84 × 10^-8

• Iron ⠀⠀⠀⠀⠀⠀⠀⠀⠀ 10.0 × 10^-8

From the given table we observe that Silver has lowest resistivity.

So, Silver has lowest resistivity .

Additional Information!!

The Joules law states that

• The heat produce in a resistor is directly proportional to the square of a current for a given resistance . It means that I² is directly proportional to H.

• The heat produce in a resistor is directly proportional to the resistance of given current . It means that R is directly proportional to R.

• The heat produce in a resistor is directly proportional to the time which the current flows through the resistor.It means that t is directly proportional to H.

Mathematical term of Joules law of heating .

→ H = I²Rt

here

H is the heat produce

I is the current flows

R is the resistance

t is the time taken.

Answer 2

Answer:

$\huge \sf \: required \: answer$

Silver

$\huge \sf \: explanation$

The table shows why we select silver

$\large \bf \boxed {\begin{array}{|c|c|} \underline{Material} & \underline {Resistivity(Ohm's\:meter)} \\ silver & 1.60 \times{10}^{-8} \\ copper & 1.62 \times {10}^{-8} \\ nickel & 6.84 \times {10}^{-8} \\ iron & 10 \times{10}^{-8}\end{array}}$

$\therefore$ Silver is the correct answer