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Australian AMC 2021 - Senior Question 13

AMC AUSTRALIA · Australian AMC 2021 - Senior

Question 13

A physics formula is $r=\dfrac{mV}{qB}$. If $q$ is trebled, $m$ is halved, and $r$ and $B$ stay unchanged, what happens to $V$?
  1. increases by a factor of 6
  2. decreases by a factor of 5
  3. stays the same
  4. doubles
  5. increases by a factor of 3