A stone tied to a string of length l is whirled around a vertical circle with the other end of the string at the centre. At a certain instant of time the stone is at the lowest position and has a speed u. What is the magnitude of change in its velocity as it reaches … Continue reading Motion in a vertical circle and conservation of energy

# Current electricity – Numerical problems

In a potentiometer arrangement a cell of emf 1.25 V gives a balance point at 35 cm length of the wire. If the cell is replaced by another cell, the balance point shifts to 63 cm. What is the emf of the second cell? E1= 1.25 V l1 = 35 cm l2 = 63 cm … Continue reading Current electricity – Numerical problems