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- class 12 to determine resistance of a galvanometer by half deflection method and to find its figure of merit viva questions
To Determine Resistance of a Galvanometer by Half-Deflection Method and to Find Its Figure of Merit - Physics Practical Class 12 Viva Questions with Answers
- What is a galvanometer?
Answer: A galvanometer is a measuring device that measures a small electrical current or a function of the current by deflection of a moving coil.
- What is the formula to calculate the figure of merit of the galvanometer?
Answer: The formula to calculate the figure of merit of the galvanometer is \(\begin{array}{l} k=\frac{1}{\Theta }\frac{E}{R+G}\end{array} \) .
- What is an ammeter?
Answer. An ammeter is a measuring instrument used to calculate the current in a circuit.
- What is the unit to measure electric current?
Answer: Ampere is the unit used to measure the electric current.
- Define ampere.
Answer: An ampere is a unit of measure of the rate of electron flow or current in an electrical conductor.
- How is a galvanometer converted to an ammeter?
Answer: A galvanometer is converted into an ammeter by connecting a low resistance in parallel with the galvanometer.
- On the galvanometer scale, why is zero placed in the middle?
Answer: Zero is placed in the middle of the galvanometer since the galvanometer needle can deflect on both sides.
- How is an ammeter connected in a circuit?
Answer: An ammeter should be connected in the series pattern with the circuit. When the ammeter is placed in series, the entire current of the circuit can be calculated when it passes through it.
- Why is this method known as the half deflection method?
Answer: Here, the deflection is made half using a shunt resistance S. Hence It is known as the half deflection method.
- Are there positive and negative terminals in the galvanometer?
Answer: There are no positive and negative terminals in the galvanometer.
Stay tuned to BYJU’S to learn about other devices like Galvanometer, Ammeter and Voltmeter in an interesting and engaging way.
- To determine resistance of a galvanometer by half-deflection method and to find its figure of merit
- Difference between ammeter and galvanometer
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10 ECE of Copper - experiment
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Preview text
Experiment no: 13, measurement of ece of copper.
1 Objective 1 Apparatus required 1 Theory & Formula used 1 Procedure 1 Apparatus and circuit diagram 1 Observation table 1 Calculation 1 Result 1 Error Analysis 2. Precautions 2 Viva-voice questions
1 Objective: To determine the Electro – Chemical Equivalent (ECE) of copper using a
Tangent galvanometer.
1 Apparatus used: Copper voltmeter, Tangent galvanometer, Rheostat,
one way key, Battery, Commutater, Stop watch, Sand paper and connecting wire.
1 Formula used: Copper voltmeter it consists of a glass vessel containing 16 to 22%
solution Cuso 4 with a few drops of sulphuric acid. The anode consists of pair of copper plates. Faraday’s Law of Electrolysis (i) According to first law mass deposited M = Zit Where Z is constant and is called the Electro – Chemical Equivalent of the substance.
For tangent galvanometer I =
1 Procedure:
Draw a neat diagram indicating the scheme of the connections as shown in fig.
Clean the cathode plate with a piece of sand paper and weigh it accurately.
Place the coil of T in magnetic meridian. Rotate the compass box to make the pointer read zero-zero.
Suspend an extra copper plate in the copper voltmeter for the cathode and complete the circuit containing an accumulator, rheostat and an ammeter.
Using copper test plate as cathode, allow a current to flow in circuit and read the deflection. Now reverse the current with help of commutator and again read the deflection if the two deflections are the same then the coil are in the magnetic eridian otherwise rotate slightly the coil till the two deflection are same. The pointer should read zero when no current is passed.
Using rheostat adjust the deflection (in the range 40-50).
Switch of the current and remove the test plate and place weighed plate as cathode.
Now switch on the current and immediately start stop watch. Take the deflection reading after every 5 minutes and keep it constant using rheostat. After about 20 minutes reverse the current and note the deflection .At the end of other half of time switch off the current and note down the reading of stop watch.
Remove the copper plate and immerse it in water and dry it and weigh it with chemical balance.
Measure the diameter of the coil and calculate radius by equating to 2πr. Both external and internal circumference should be measured and then mean of the radius.
1 Apparatus and circuit diagram:
1 observation table:.
Value of the field H = ----- 0 Oersteds Radius of the coil (r) =-------------- cm Numbers of turns in each coil (n) = Mass of the copper plate before deposition of copper =----------------- gm Mass of the copper plate after deposition of copper =------------------- gm Mass of copper deposited = ------------------------- gm Initial reading of stop watch =----------------------- sec Final reading of stop watch =------------------------ sec Total time taken =------------ sec
2 Viva-voice questions:
Q. 1 do you mean by electro-chemical equivalent (ECE) of an element? A. Electro-chemical equivalent of a substance is defined as the mass of the ion liberated at the electrode when unit charge is passed through the electrolyte.
Q. What is the difference between the electro-chemical equivalent and chemical equivalent? A. The ECE is defined as the mass liberated from the electrolyte by a unit charge flow. The chemical equivalent is defined as the weight of the element which combines or displaces on part by weight of hydrogen or 35 part by weight of chlorine. It is equal to the ration of the atomic weight to valency.
Q. Which electrolyte is used in copper voltameter? A. It contains copper sulphate solution as electrolyte. Some quantity of conc. H2SO4 and alcohol is also added to it.
Q. What is the reason of taking two anodes plates in copper voltameter? A. This is done to get equal deposition of copper on both sides of the anode plate.
Q. What is the reduction factor and what is its unit? A. It is defined as the amount of current which produces a deflection of 45 in the tangent galvanometer. The reduction factor is inversely proportional to the number of turns. It also depends upon the radius of the coil and the field. Its unit is ampere.
- Multiple Choice
Course : Physics-II (AP-102)
University : delhi technological university, this is a preview.
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