Question

7 In the circuit shown, AB up a resistance wire of uniform cross-section,
in which a potential gradient of 0.01 V/cm exists.
(a) If the galvanometer G shows zero deflection, what is the emf €1 of
the cell used?
(b) if the internal resistance of the driver cell increases on some account, how will it affect the balance point in the experiment?​

Answer 1

Answer:

No links please In the circuit shown in Fig 2 38 AB is a resistance wire of uniform cross section ... of 0 01 V • cm-l exists (i) If the galvanometer G shows zero deflection, what is the emf El of the cell ... Share 5 Follow1 ... The potential gradient of wire is=0.01Vper cm and is balanced by 180cm by the cell E1.

Explanation:

Answer 2

Answer:

The potential gradient of wire is=0.01Vper cm

and is balanced by 180cm by the cell E1.

So the emf will be 0.01*180=1.8V because at 180cm the galvanometer will show zero deflection.

ii) When the internal resistance of driver cell is increased than the current decreases as I=E/R+r so the potential drop to balance the cell E1 will decrease so to compensate it more length of wire will be used.So the balance point will shift towards right.