Question

Four wires each of length `2.0` meters area bent into four loops `P,Q,R` and `S` and then suspended into uniform magnetic field. Same current is passed in each loop. Which statement is correct?

A. `P`
B. `Q`
C. `R`
D. `S`

Answer 1

Correct Answer - D
For given length, circle has maximum area.
`tau prop M prop A`
`tau prop A`