In a meter bridge experiment, resistances are connected as shown in figure. The balancing length l1 is 55 cm. Now an unknown resistance x is connected in series with P and the new balancing length is found to be 75 cm. The value of x is
Why this question ? Tip: In such problems of meter bridge whenever an unknown resistance is connected in series or parallel with any of the arm resistances, first find out net resistance for that arm and then apply balanced bridge condition for new null point. |