Three wires, of the same diameter, are connected in turn between two points maintained at a constant potential difference. Their resistivities and lengths are rho and L (wire A), 1.2rho and 1.2L (wire B), and 0.9rho and L (wire C).
1. Rank the wires according to the rate at which energy is transferred to thermal energy within them, greatest first. (Use only ">" or "=" symbols. Do not include any parentheses around the letters or symbols.)

C > A > B

Explanation:

Given

Three wires A , B and C with Resistivities and lengths as given

A  and L

B and  1.2 L

C  and  L

we know that resistance is given by

where A=cross-section of wire

It is given that common Potential is applied for three wires

Resistance of A , B and  C are

Thermal Energy is given by

for same Potential difference

Thus maximum heat is generated in wire C and minimum in wire B

thus C > A > B

the independent variable, or the one that is intentionally manipulated is the speed.

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