BlogIIT-JEEImportant Topic of Maths: Cross Product

Important Topic of Maths: Cross Product

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    Cross product is a binary operation on two vectors in 3-dimensional area. It brings about a vector that is opposite to the two vectors. The Vector fabricated from two vectors, a and b, is denoted by a × b. Its resultant vector is opposite to an and b. Vector merchandise are also known as move merchandise. Cross made from two vectors will deliver the resultant a vector and calculated the use of the Right-hand Rule.

    Cross Product of Two Vectors

    The vector product or cross manufactured from two vectors A and B is denoted via A × B, and its resultant vector is perpendicular to the vectors A and B. The pass product is usually used to decide the vector, that’s perpendicular to the plane surface spanned by vectors, while the dot product is used to discover the perspective between two vectors or the duration of the vector. The pass manufactured from vectors, say A × B, is equal to every other vector at right angles to both, and it happens in the 3-dimensions.

    Cross Product Formula

    If θ is the angle between the given two vectors A and B, then the formula for the cross product of vectors is given by:

    A x B = A.B sin θ

    A, B are the two vectors

    A, B are the extents of the two vectors

    θ is the angle among vectors and n
    is the unit vector perpendicular to the aircraft containing the given two vectors, in the direction given through the proper-hand rule.

    Cross product of two vectors Formula

    Consider two vectors,

    A = ai + bj + ck

    B = xi + yj + zk

    We recognize that the same old basis vectors i, j, and k satisfy the under-given equalities.

    I × j = k and j × i = –k

    j × okay = i and okay × j = –i

    ok × i = j and that i × k = –j

    Also, the anti-commutativity of the cross product and the wonderful absence of linear independence of these vectors signifies that:

    i × i = j × j = k × k = 0


    A × B = (ai + bj + ck) × (xi + yj + zk)

    = ax(i × i) + ay(i × j) + az(i × okay) + bx(j × i) + by way of(j × j) + bz(j × okay) + cx(k × i) + cy(k × j) + cz(okay × okay)

    By making use of the above cited equalities,

    A × B = ax(0) + ay(k) + az(-j) + bx(-k) + by way of(0) + bz(i) + cx(j) + cy(-i) + cz(0)

    = (bz – cy)i + (cx – az)j + (ay – bx)ok

    Cross Product Matrix

    We also can derive the system for the move made from two vectors using the determinant of the matrix as given under.

    A = ai + bj + ck

    B = xi + yj + zk


    A × B = (bz – cy)i – (az – cx)j + (ay – bx)k

    = (bz – cy)i + (cx – az)j + (ay – bx)okay

    Right-hand Rule Cross Product

    We can find the route of the unit vector with the help of the proper-hand rule. In this rule, we will stretch our proper hand so that the index finger of the right hand inside the route of the primary vector and the middle finger is in the route of the second vector. Then, the thumb of the proper hand suggests the path or unit vector n. With the help of the right-hand rule, we will easily show that vectors’ pass product is not commutative. If we have two vectors A and B, then the diagram for the proper-hand rule is as follows:

    Right-hand Rule Cross Product

    Cross Product Properties

    To locate the go made from vectors, we will use houses. The residences such as anti-commutative assets, zero vector assets plays an essential position in locating the cross manufactured from two vectors. Apart from these properties, a few other homes encompass Jacobi belongings, distributive assets. The houses of move-product are given under:

    anti commutative property: A X B = -B X A

    Distributive property: A X (B + C) = A X B + A X C

    Jacobi property: A X (B X C) + B X ( C X A ) + C X ( A X B ) =0

    Zero vector property: a x b = 0 if a=0 or b=0

    Cross Product of Perpendicular Vectors

    Cross made of vectors is equal to the manufactured from their magnitude, which represents the region of a rectangle with aspects X and Y. If vectors are perpendicular to each different, then the pass product system becomes:

    θ = ninety degrees

    We realize that, sin 90° = 1


    X * Y = X.Y sinθ

    Also read: Important Parabola Formulas for JEE


    What means cross product?

    Noun Mathematics. A vector perpendicular to two given vectors, u and v, and having value identical to the manufactured from the magnitudes of the two given vectors accelerated through the sine of the attitude among the two given vectors, commonly represented by means of u × v.

    What is the cross result of two vectors?

    Cross product of vectors is the technique of multiplication of two vectors. A pass product is denoted via the multiplication signal(x) between vectors. It is a binary vector operation, described in a three-dimensional gadget.

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