Sensitivity of potentiometer can be increased by
Sensitivity of the potentiometer means the smallest potential difference it can measure. It can be increased by reducing the potential gradient. The same is possible by increasing the length of the potentiometer. Hence the correct option is option C.
In a potentiometer a cell of e.m.f 2V gives a balance point at 30cm. If the cell is replaced by another cell and the balance point shifts to 60cm.What is the e.m.f of the other cell?
We can use the formula E1/E2=L1/L2
When the position of cell and galvanometer in a Wheatstone bridge is inter-changed, its balanced condition
For balanced Wheatstone bridge which is shown in figure a, P/Q=S/R
If we interchange the cell and galvanometer then circuit becomes as shown in figure b.
and balanced condition, P/S=Q/R⇒P/Q=S/R
Thus, balanced point remains unchanged.
An electric bulb is rated 220 V and 100 W. Power consumed by it operated on 110 V is
Power, P= V2/R
The current flow in the circuit,
i= V′/R (V′= supplied voltage)
The voltage drop across the bulb is 110V
The power consumed by the bulb,
The correct option is C.
Meter Bridge or Slide Wire Bridge is a practical form of
When Wheatstone bridge is in balance condition, the current through galvanometer will be
The resistance in ohms in the four arms of a Wheatstone bridge are as follows. In which combination of the following is the bridge balanced?
Wheat stone bridge follows
P/Q = R/S
So 2/3 = 4/6
Two bulbs A and B are rated 100 W, 120 V and 10 W, 120 V respectively. They are connected across a 120 V source in series. Calculate the current through each bulb.
We know that, P=VI
We know that, P=VI
Bulb A will consume more energy than bulb B when they are connected in parallel.
Wheatstone bridge is used to measure
The Wheatstone bridge and its balance condition provides a practical method for the determination of