2. To Determine the Focal Length of Two Lenses by Nodal Slide and Locate the Position of Cardinal Point

3. To Determine the Specific Rotation of Cane Sugar Solution Using Bi-Quartz Polarimeter

4. To Determine the Wavelength of Spectral Lines Using Plane Transmission Grating

5. To Determine the Specific Resistance of the Material of Given Wire Using Carey Foster Bridge

6. To Determine the Variation of Magnetic Field Along the Axis of a Current Carrying Coil and Then to Estimate the Radius of the Coil

7. Determination of Stefan’s Constant Using Diode

8. To Calibrate the Given Voltmeter and Ammeter Using Potentiometer

9. To Study the Hall Effect and Determine the Hall Coefficient, Carrier Density and Mobility of a Given Semiconductor Material

10. To Determine the Energy Band-Gap of a Semiconductor Material/ Resistivity of Semiconductors by Four Probe Method at Different Temperatures

11. Magnetic Hysteresis Loop Tracer

12. To Determine the Coefficient of Viscosity of Water by Poiseuille’s Method

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Collision Balls - Conversion Of MomentumDemonstrates that for every action, there is an equal & opposite reaction. Lift & drop one ball to see one ball pop out from the other side. Lift two balls & ball pop out. Leave this popular toy on your desk for a school year of enjoyment & learning.For demonstrating the collision of ball including 6 balls hung on an iron frame & Stand. To demonstrate the conversion of energy & momentum

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To study the frequency of A.C. Mains. The set consists of Step Down Transformer, weights with hanger, a pair of Bar Magnets, an arrangements to place the Bar Magnets, (or Electromagnet) & Sonometer with brass partsA Sonometer is a device for demonstrating the relationship between the frequency of the sound produced by a plucked string, and the tension, length and mass per unit length of the string. These relationships are usually called Mersenne's laws after Marin Mersenne (1588-1648), who investigated and codified them. For small amplitude vibration, the frequency is proportional to:

a. the square root of the tension of the string,

b. the reciprocal of the square root of the linear density of the string,

c. the reciprocal of the length of the string.

The usual sonometer is horizontal, like the one below at Kenyon College, and the tension is supplied by the weight of the masses hung on the ends of the wires after they pass over the pulleys. This arrangement has the defect that the strings and bridge cannot be seen by the class.

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**Item Code:**BTC-BSC-1234**Minimum Order Quantity:**1 Piece

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Being a leader of this domain, we offer Kits for performing various- Easy to set up
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- Exp-1 To determine the refractive index of the material of prism using sodium light.
- Exp-2 To determine the dispersion power of a prism.
- Exp-3 To determine the resolving power of the prism.
- Exp-4 To determine the wavelength of sodium light using a plane diffraction grating.
- Exp-5 To determine the resolving power of a plane diffraction grating.
- Exp-6 To verify Cauchy's equation (Mercury light source required).

- Advance spectrometer
- Diffraction grating
- Intermediate spectrometer
- Micrometer slit
- Prism
- Sodium light source
- Spectrometer Goniometer

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**Computer Logic Training Board **has been designed specifically for the study of 4 line to 16 line Decoder, 1 to 16 demultiplexer and its application as sequencer. This Training Board gives a better understanding of decoding 4 lines to 16 lines. It also explains the phenomena of Demultiplexing with one input signal and sixteen outputs using four control signals. It gives an idea to sequence among a number of states. The board is absolutely self contained and requires no other apparatus. Practical experience on this board carries great educative value for Science and Engineering Students.**Object:**

- 01. To demonstrate the operation of a 1 line to 16 line demultiplexer.
- 02. To demonstrate the operation of 4 line to 16 line decoder.
- 03. To demonstrate how 4 line to 16 line decoder can be used to sequence among any number of states, between one and fifteen. (This is called a programmable sequencer with 4 binary inputs and 16 outputs).

**Features:****The board consists of the following built-in parts :01. +5VD.C. at 200mA, IC regulated power supply internally connected.02. 1 to 16 Decoder/Demultiplexer IC.03. LEDs (22 No’s) for visual indication of status.04. SPDT (6 No’s) switches for logic selection.05. Adequate no. of other Electronic Components.06. Mains ON/OFF switch, Fuse and Jewel light.**

- The unit is operative on 230V ±10% at 50Hz A.C. Mains.
- Good Quality, reliable terminal/sockets are provided at appropriate places on panel for connections/ observation of waveforms.
- Strongly supported by detailed Operating Instructions, giving details of Object, Theory, Design procedures, Report Suggestions and Book References.

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Calnder Grifith Bridge/ Platinum Resistance Thermometer SetupEXPERIMENT No.11Object:To find the temperature coefficient of resistances for platinum, using a platinum resistance thermometer and a callender and Griffith’s bridge.Apparatus Used:Callender and Griffith’s bridge, platinum resistance thermometer, galvanometer and connection wires.Formula Used:The temperature coefficient of resistance,α , is given by the formula:α= R2–R1 / R1t2–R2t1Where R1= resistance of the platinum wire at t1oCR2= Resistance of the platinum wireat t2oCUsing a Callendar and Grafith bridge the resistance R, is given by the formula:2 x ρ, R = r Where ρ= resistance per unit length of the potentiometer wire.r = resistance introduced in resistancebox.x = distance of null point from middle point (electrical zero.)Theproper sign is used according as the balance point linesto the right or left of the electrical zero.Procedure:(a) Determination of electrical zero:Complete the connections as shown in fig. Shortcircuit the gaps PPand CCi.e. connect the terminals by a thick copper wire. Make the resistance R zero by moving the key of variable resistance. Now make the cell circuit onby inserting the plug key. Determine the position of null point by moving the jockey on the bridge wire. The null point gives the position of electrical zero.(b)Determination of resistance per unit length (ρ) of the bridge wire:To determine the value of ρ, the gap (PP) and (CC) are short circuited. Thevalue from R is adjusted to a small value r to obtain the balance. Let the balance be on the left side of O at a distance x’, then,0 = r -2ρx’ρ = r / 2x’Determination of R2and R1at steam temperature and room temperature respectively:(i) Connect the compensating leads and platinum leads of platinum resistance thermometer to the callender and Graffith’s bridge at CC and PP respectively. Otherconnections are made according to the circuit diagram shown in fig.(ii)Place the bulb of thermometer in a tumbler of ordinary water bath at room temperature and wait for some time to ensure that it has acquired the temperature of water. Notethe temperature of water with the help of mercury thermometer. By introducing a suitable resistance, in the circuit of compensating leads with the help of moving coil resistance, balance is obtained. This length of the bridge wire is noted. Using the following formula the resistance of platinum wire R1at room temperature is calculated:R1= R 2ρxWhere R =resistance introduced in the moving coil resistance.x = length adjusted on bridge wire to get the null point.(iii) Now the platinum resistance thermometer is placed in hypsometer or in a hot water bath and wait for some time such that it acquires the constant temperature of the bath. Note this temperature also and determine again the resistance of the platinum wire as described above in the point (ii) letthe resistance at this temperature be denoted by R2.(iv) Calculate the value of α using the relation,α= R2 –R1/R1t2–R2t1Result:The temperature coefficient of resistance for platinum = .......per oC

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Product Details:Power | 220V |

Brand | BTC INSTRUMENTS |

Phase | Single Phase |

We are Manufacturing All Transfomers for Physics Lab apparatus under Our Brand name BTC instruments.

**Model Transformers:**Nicely demonstrated on base. Input and output leads brought out on terminals on bakelite panel.**Model Transformers:**Same as above but with step up voltage.**Model Transformers:**Step Up/Down combined.**Demonstration Transformers :**Fitted on board with one mains coil of 220 volt and two interchangeable secondary coils giving 6 and 12 voltsA.C. at 2 amps.Assembly & interchanging of coils can be done easily. Input and out-put leads brought out on terminals.**Step Down Transformers:**For lowA.C. output voltage requirements in laboratories. Housed in Steel Cabinet.

(a) 2-4-6 volts : at 2 amps.A.C.

(b) 2-4-6-8-10-12 volts : at 1 amps.A.C.

(c) 2-4-6-8-10-12 volts : at 2 amps.A.C.

(d) 2-4-6-8-10-12 volts : at 3 amps.A.C.

(e) 2-4-6-8-10-12 volts : at 5 amps.A.C.

(f) 2-4-6-12-18-24 volts : at 2 amps.A.C.

(g) 2-4-6-12-18-24 volts : at 3 amps.A.C.

(h) 2-4-6-12....30 volts insteps of 2 volts : at 2 amps.A.C.**Step Down Transformers:**For Electromagnet & sonometer Experiments 0-6-8 volts at 1Amp.A.C.**Sodium Vapour Lamp Transformers:**Housed in steel Cabinet withAuto leak type transformer giving 440 volts initially which reduces automatically when the lamp is excited.

(a) Output : 35 watts

(b) Output : 55 watts

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**Item Code:**BTC-251**Pay Mode Terms:**L/C (Letter of Credit)

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Product description:

About 20cm. in dia and 45mm. wide turned and carefully balanced, mounted on a horizontal shaft, held in ball bearings.The wheel is marked and pointer is fixed to the bracket.The bracket has four holes and can be fixed to the wall.

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