(a) Two batteries of emfs 3V & 6V and internal resistances 0.2Ω & 0.4Ω are connected in parallel. This combination is connected to a 4Ω resistor. Find:
1. the equivalent emf of the combination
2. the equivalent internal resistance of the combination
3. the current drawn from the combination
OR
(b) (i) A conductor of length l is connected across an ideal cell of emf E. Keeping the cell connected, the length of the conductor is increased to 2l by gradually stretching it. If R and R′ are initial and final values of resistance and vd and vd′ are initial and final values of drift velocity, find the relation between (i) R′ and R and (ii) vd′ and vd.
(ii) When electrons drift in a conductor from lower to higher potential, does it mean that all the 'free electrons' of the conductor are moving in the same direction ?
a. Two batteries of emfs 3V & 6V and internal resistances 0.2Ω & 0.4Ω are connected in parallel. This combination is connected to a 4Ω resistor. Find: (1) the equivalent emf of the combination (2) the equivalent internal resistance of the combination (3) the current drawn from the combination.
b. OR: (i) A conductor of length l is connected across an ideal cell of emf E. Keeping the cell connected, the length of the conductor is increased to 2l by gradually stretching it. If R and R′ are initial and final values of resistance and vd and vd′ are initial and final values of drift velocity, find the relation between (i) R′ and R and (ii) vd′ and vd.
c. When electrons drift in a conductor from lower to higher potential, does it mean that all the 'free electrons' of the conductor are moving in the same direction ?