In a potentiometer arrangement, a cell gives a balancing point at \( 75 \, \text{cm} \) length of wire. This cell is now replaced by another cell of unknown emf. If the ratio of the emf's of two cells respectively is \( 3:2 \), the difference in the balancing length of the potentiometer wire in above two cases will be ________ \( \text{cm} \).
