The resistances in the two arms of the meter bridge are 5 and R , respectively. When the resistance R is shunted with an equal resistance, the new balance point is at 1.6 l1. the resistance 'R' is:
10
15
20
25
As discussed in @8177
Option 1)
10
This answer is incorrect
Option 2)
15
This answer is correct
Option 3)
20
This answer is incorrect
Option 4)
25
This answer is incorrect