In experiment of the potentiometer wire of length 100 cm has a resistance of 10, It is connected in series with a resistance R and a cell of emf 2 volts and of negligible internal resistance. A Source of emf 10mV is balanced against a length of 40 cm of the potentiometer wire. What is the value of the external resistance?

The function is

For such questions, we should check the rules of increasing and decreasing function.

If the function is decreasing in its domain then

The function is

We have to see the rules for a increasing and decreasing function.

If then the maximum value of is

The minimum value of the function where is

In the experiment of potentiometer wire is 100 cm long shown in figure When AC=40 cm, no deflection occurs in the galvanometer. What is the value of R ?

Consider the potentiometer circuit shown. The potentiometer wire is 600 cm long and having restance 15r At what distance from the point A should the jockey touch the wire to get zero deflection in the galvanometer?

Circuit for the measurement of resistance by potentiometer is shown. The galvanometer is first connected at point-A and zero-deflection is observed at length PJ=10 cm. In the second case, it is connected at a point and zero deflection is observed at a length from P. Then what is the unknown resistance X?

The current taken from the 30 V supply and the current through the 6 resistor are respectively.

common base amplifier circuit, calculate the change in base current if that in the collector current is 2 mA and =0.98

The current gain of a transistor in common base mode is 0.99. To change the emitter current by 5 mA. What will be the necessary change in collector current?

In a transistor amplifier β=62,=5000Ω  and internal resistance of the transistor is 500Ω. What will be the ratio of power amplification to voltage amplification?

In a transistor, a change of 8.0 in the emitter current produces a change of 7.8 mA in the collector current. What change in the base current is necessary to produce the same change in the collector current?

A transistor is connected in common emitter configuration. The collector supply is 8V  and the woltage drop across a resistor of 800 in the collector circuit is  0.5V. If the current gain factor   is 0.96, then base current will be.........

In a common emitter amplifier, using output resistance of 5000Ω and input resistance of 2000Ω, if the peak value of input signal voltage is 10mv and β=50 then what is the peak value of output voltage?