Which statement describes what happens to an object when it becomes polarized?

Which statement describes what happens to an object when it becomes polarized?

When an object becomes polarized, its center of positive charge becomes separated from its center of negative charge. Overall, there are just as many positive charges as negative charges; the object has a balance of charges and is therefore neutral.

Which one of the following statements concerning Ohm’s Law is true?

Ohm’s law is true when the resistivity of a material is independent of the applied electric field. Resistivity of the material should be constant, so option d is correct.

Which one is correct according to Ohm’s law?

Answer: Ohm’s law states that the electrical current (I) flowing in an circuit is proportional to the voltage (V) and inversely proportional to the resistance (R). Therefore, if the voltage is increased, the current will increase provided the resistance of the circuit does not change.

What is being measured by an instrument called ohmmeter?

Ohmmeter, instrument for measuring electrical resistance, which is expressed in ohms. In the simplest ohmmeters, the resistance to be measured may be connected to the instrument in parallel or in series. If in parallel (parallel ohmmeter), the instrument will draw more current as resistance increases.

What are the tools used for measuring and portioning?

Some of the most common tools include portion scales, food dishers, and spoodles. But even everyday kitchen supplies, like measuring cups and ladles, are great tools for controlling portions.

What are primary and secondary instruments?

There are two types of Electrical Measuring Instruments: 1. Absolute Instruments – these instruments give the values of the quantity that has to be measured in terms of physical constants and their deflection only. Secondary instruments – these are instruments whose output is measured to give the value of the quantity.

What are the classification of secondary instrument?

Some of the very widely used secondary instruments are: ammeters, voltmeter, wattmeter, energy meter (watt-hour meter), ampere-hour meters etc. Classification of Secondary Instruments: (a) Classification based on the various effects of electric current (or voltage) upon which their operation depend.

What is difference between primary and secondary measurement?

Pressure testing equipment calibration is important in ensuring that you collect accurate and reliable data through your work. To put it simply, a primary standard is a factual universal measurement while a secondary standard is a device directly calibrated previously by the primary standard.

What is the difference between a primary and a secondary standard?

A primary standard is a substance of known high purity (99.9% pure) which may be dissolved in a known volume of solvent to give a primary standard solution. A secondary standard is a substance whose active agent contents have been found by comparison against a primary standard.

What is primary and secondary standard give example?

A primary standard is a reagent for which we can dispense an accurately known amount of analyte. For example, a 0.1250-g sample of K2Cr2O7 contains 4.249 × 10–4 moles of K2Cr2O7. Appendix 8 provides examples of some common primary standards. Secondary Standards. The base NaOH is an example of a secondary standard.

What are primary and secondary standard with example?

A primary standard is a soluble solid compound that is very pure, with a consistent formula that does not change on exposure to the atmosphere, and has a relatively high molar mass. A secondary standard is a solution of known concentration derived from a primary standard.

What is a secondary reference standard?

A secondary standard is. a standard established by comparison with a primary standard … A secondary standard may be used for routine quality control purposes for any of the uses described above for primary standards, provided that it is established with reference to the primary standard.

What is difference between working standard and reference standard?

“A reference standard (i.e., primary standard) may be obtained from the USP/NF or other official sources (e.g., CBER, 21 CFR 610.0). A working standard (i.e., in-house or secondary standard) is a standard that is qualified against and used instead of the reference standard.”

What is meant by reference standard?

A reference standard or reference material (RM) is a “material or substance one or more of whose property values are sufficiently homogeneous and well established to be used for the calibration of an apparatus, the assessment of a measurement method, or for assigning values to materials”, whereas a certified reference …