Class 12 Physics Practical File Full Scale Deflection
Class 12 Physics Practical File Free Study Material

Class 12 Physics Practical File Free Study Material

Access free study material by clicking on the respective subtopics.

The exhaustive content provided for each of these subtopics will guide you through what you can expect to study in Class 12 Physics.

The concepts taught in the 12th standard are the fundamentals of the subject.

Students must learn these concepts in-depth to develop their skills in the subject and build a strong foundation.

If the galvanometer shows deflection on both sides of its zero mark for these two points of contact of the jockey, null point will be somewhere on the wire AC.

I thought in the day of my desolation when no one would share the file or they themselves have not completed it or maybe have done the whole practical wrong, interred a sense of Board Exam in my bones.

If you find anything missing or above your head, do post some comments as there are many others who visit this site and these might be able to help you out of this muck.

VIR R depends upon the nature of material, temperature dimensions of the conductor.

If it is not so, adjust the pointer to coincide with the zero mark by adjusting the screw provided near the base of the needle using a screw driver.

Shift the rheostat contact slightly to increase the applied voltage.

Its working is based on the principle that a coil placed in a uniform magnetic field experiences a torque when an electric current is set up in it.

When a coil carrying current I is placed in a radial magnetic field, the coil experiences a deflection which is related to I as Ik where k is a constant of proportionality and is termed as figure of merit of the galvanometer.

From the high resistance box (R-BOX 1) (1-10 k), remove 5 k key and then close the key K1.

Class 12 Physics Practical File Full Scale Deflection

Adjust the resistance R from this resistance box to get full scale deflection on the galvanometer dial.

Record the values of resistance, R and deflection.

Insert the key K2 and keep R fixed.

Adjust the value of shunt resistance S to get the deflection in the galvanometer which is exactly half of.

Note down S. Remove plug K2 after noting down the value of shunt resistance, S.

Calculate the galvanometer resistance G and figure of merit k of galvanometer using Equations.

Here you can find the value of unknown resistances without interchanging the R.

B. and unknown wire in the gaps.

After finding the value of X1 and X2, connect the two in series as shown in figure.

Proceed in the same way as in experiment 2.

Take at least three sets of observations for balance point lying between 30 cm and 70 cm.

Calculate the effective resistances using equation (ii).

Compare the measured values of effective resistances using Meter Bridge with the calculated values.

By experiment,. Hence the law of combination of resistances in series is verified.

The four resistances are connected to each other as shown and if the bridge is inbalanced state, i.e., there is no deflection in the galvanometer (G), PQRS We can use this relation to find the unknown resistance of the given material of wire.

The unknown resistance X can be found by Meter bridge which uses the principle of Wheatstone bridge.

The unknown resistance X of the given wire is obtained by relation: And specific resistance of the material of a given a wire is obtained by: where d diameter of the wire and L length of wire.

From this, obtain the value of its radius r.

Clean the insulation at the ends of connecting wires with a piece of sand paper.

Tighten all plugs of the resistance box (RBOX) by pressing each plug.

Set up the circuit as shown in Fig.

E 2.1 with unknown resistance wire of known length in gap E.

Next, introduce some resistance R in the circuit from the resistance box.

Bring the jockey J in contact with terminal A first and then with terminal C.

Note the direction in which pointer of the galvanometer gets deflected in each case.

Make sure that jockey remains in contact with the wire for a fraction of a second.