In physics, the null point means the point in a field where the field quantity is zero. The field quantity is zero because the two or more opposing forces at the null point cancel each other. The field can be a tensor, scalar or a vector.
What is null in electronic?
In radio electronics, a null is a direction in an antenna’s radiation pattern where the antenna radiates almost no radio waves, so the far field signal strength is a local minimum. Nulls occur because different parts of an antenna radiate radio waves of different phase.
What do you mean null?
1 : having no legal or binding force : invalid a null contract. 2 : amounting to nothing : nil the null uselessness of the wireless transmitter that lacks a receiving station— Fred Majdalany. 3 : having no value : insignificant … news as null as nothing …— Emily Dickinson.
What is null point in gravitation?
What exactly is the gravitational null point? Null point is the point between the Earth and the Moon where the Earth’s gravitational field is cancelled out by the Moon’s gravitational field.
Why is null an object?
In object-oriented computer programming, a null object is an object with no referenced value or with defined neutral (null) behavior.
Is null True or false?
The value null represents the intentional absence of any object value. It is one of JavaScript’s primitive values and is treated as falsy for boolean operations.
What is null technique?
: a method of measurement in which an unknown quantity (as of electric current) is compared (as in a Wheatstone bridge) with a known quantity of the same kind and found equal by zero response of the detector.
What is null in math?
In mathematical sets, the null set, also called the empty set, is the set that does not contain anything. It is symbolized or . There is only one null set. This is because there is logically only one way that a set can contain nothing.
IS null same as 0?
No its not the same as null means a value that is unavailable unassigned or unknown and zero is a defined value.
How do you use null?
The basic rule is simple: null should only be allowed when it makes sense for an object reference to have ‘no value associated with it’. (Note: an object reference can be a variable, constant, property (class field), input/output argument, and so on.)
What is null point in electric field?
A null point is a point in a field where field is zero as the result of two or more opposite quantities completely cancel each other. From the figure, we can clearly see that at point C, field of two positive point charges is cancelling each other and is zero.
Why is there no gravity between earth and moon?
The Moon’s surface gravity is weaker because it is far less massive than Earth. A body’s surface gravity is proportional to its mass, but inversely proportional to the square of its radius.
Where does earth and moon gravity cancel?
The point where gravitational attraction toward the Earth and Moon cancel one another is much closer to the center of the Moon than the center of the Earth. Thanks for making it clear. And sorry for the misspellings :P.
Can objects be null?
In object-oriented computer programming, a null object is an object with no referenced value or with defined neutral (“null”) behavior. The null object design pattern describes the uses of such objects and their behavior (or lack thereof).
What is the class of null?
The Null class is the only class which does not implement Object . It is a compile-time error for a class to attempt to extend or implement Null. The language contains a number of specialized operators for working with null value.
What is type of null?
The data type of null is object. The data type of an undefined variable is undefined * The data type of a variable that has not been assigned a value is also undefined *
What is the synonym of null?
(adjective) in the sense of invalid. Synonyms. invalid. inoperative. useless.
Why is false == null?
However, if you coerce null to a number it is coerced to +0 so +null == false actually returns true . null and undefined are equivalent in this case most likely because they are the only two elements in JS which cannot handle any sort of property access. (0).
IS null Real in Minecraft?
Null (sometimes called The Original Null to distinguish him from Anti Null) is the newest in a line of hoaxes created by the Minecraft fanbase. He/She supposedly leaves signs with the word “null” on them. This is not in any way creepy or unnatural, it’s due to a parsing failure by Java.
What is null indication principle?
[′nəl ‚in·də‚kād·ər] (engineering) A galvanometer or other device that indicates when voltage or current is zero; used chiefly to determine when a bridge circuit is in balance. Also known as null detector.
What is null voltage?
Null voltage means no voltage. There are instruments such as Wheatstone bridge which need zero reading and that is achieved through null voltage.
What are null instruments used for?
In null type instruments, a zero or null indication leads to determination of the magnitude of measured quantity. These instruments are more accurate and highly sensitive. These instruments are less suited for measurements under dynamic conditions.
What is a null element?
In set theory, the empty set, that is, the set with zero elements, denoted “{}” or “∅”, may also be called null set. In measure theory, a null set is a (possibly nonempty) set with zero measure.
Is ∅ an empty set?
A set that does not contain any element is called an empty set or a null set. An empty set is denoted using the symbol ‘∅’. It is read as ‘phi’.
Is ø an empty set?
In maths, the symbol Ø is used in set theory to represent the empty set.