CLASS 12 PHYSICS PRACTICAL FILE SERIES

Tighten all plugs of the resistance box (RBOX) by pressing each plug.ģ. Clean the insulation at the ends of connecting wires with a piece of sand paper. From this, obtain the value of its radius r.Ģ. Find the average diameter of the wire with a screw gauge. Where d = diameter of the wire and L = length of wire.ġ. The unknown resistance 'X' of the given wire is obtained by relation:Īnd specific resistance of the material of a given a wire is obtained by: The unknown resistance 'X' can be found by Meter bridge which uses the principle of Wheatstone bridge. We can use this relation to find the unknown resistance of the given material of wire. 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), Theory: A meter bridge is the practical application of Wheatstone bridge arrangement as shown in figure below. Materials Required: A meter bridge, galvanometer, one way key, a resistance box, a battery jockey, unknown resistance wire about 1 meter long, screw gauge and connecting wires.

CLASS 12 PHYSICS PRACTICAL FILE SERIES

Hence the law of combination of resistances in series is verified.ĮXP-4> To find resistance of a given wire using meter bridge and hence determine the specific resistance of its material. The value of effective resistance in series: Length of the wire of unknown resistance, L =. (vi) Compare the measured values of effective resistances using Meter Bridge with the calculated values.ĥ.

(iv) Calculate the effective resistances using equation (ii). Take at least three sets of observations for balance point lying between 30 cm and 70 cm.

(iii) Proceed in the same way as in experiment 2.

(ii) After finding the value of X1 and X2, connect the two in series as shown in figure. Here you can find the value of unknown resistances without interchanging the R. (i) Measure the unknown resistances X1and X2 separately using the procedure explained in experiment 2, after making the suitable connections as done in experiment 2. Where k is a constant of proportionality and is termed as figure of merit of the galvanometer. When a coil carrying current I is placed in a radial magnetic field, the coil experiences a deflection θ which is related to I as The deflection of the coil is determined by a pointer attached to it, moving on the scale. 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. Theory: Galvanometer is a sensitive device used to detect very low current. MATERIAL REQUIRED: A moving coil galvanometer, a battery or a battery eliminator (0 - 6 V), one resistance box (R-BOX 1) of range 0-10kΩ, one resistance box(R-BOX 2) of range 0-200 Ω, 2 one way keys, voltmeter, connecting wires and a piece of sand paper. Ωm-1).ĮXP-2> TO DETERMINE RESISTANCE OF GALVANOMETER BY HALF DEFLECTION METHOD AND TO FIND ITS FIGURE OF MERIT. The resistance per unit length of the wire is (R ± ΔR) = (. The potential difference across the given wire varies linearly withĢ. Theory: If I be the current flowing through a conductor & V be the potential difference across its ends, then according to Ohm’s lawġ. Materials Required: A Resistance wire, voltmeter, ammeter, battery, rheostat, meter scale, one way key, connecting wires etc. 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.ĮXP-1> TO DETERMINE THE RESISTANCE PER CM OF A GIVEN WIRE BY PLOTTING A GRAPH OF POTENTIAL DIFFERENCE VERSUS CURRENT

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Class 12 physics practical file