NEB Class 11 • Mathematics • Vectors • Concept Guide

Collinear & Coplanar Vectors: NEB Class 11 Maths Guide

Master Collinear and Coplanar Vectors through clear concepts, representations, a reliable answer method and exam-focused practice.

ConceptsWorked reasoningNEB practice

Core concept

What Collinear and Coplanar Vectors means physically

Vectors are collinear when they share one direction line and coplanar when they lie in a common plane. Scalar-multiple, cross-product and scalar-triple-product tests turn these geometric ideas into algebra.

a and b are collinear when a×b=0. Vectors a,b,c are coplanar when a·(b×c)=0.

The institutional reference gives the wider physical model; the CDC curriculum determines the NEB boundary.

Worked checkpoint with interpretation

(2,4,−2) and (−1,−2,1) are collinear because the first is −2 times the second. Three vectors with zero determinant are coplanar.

Do not stop at the number. State what the sign, ratio, spacing, frequency or direction means. A common error is Comparing magnitudes only, treating parallel position vectors as the same geometric line without context, or expanding a determinant with sign errors.

NEB answer method

Model → evidence → equation → check

First identify the system and what the question asks. Label the diagram, apparatus or reaction with SI quantities, then state the principle before selecting an equation. Solve symbolically where possible and check units, limiting cases and chemical or physical meaning.

Stage	Question	Evidence
Model	What is idealised?	Assumption stated
Representation	Which diagram fits?	Labels or balanced equation
Calculation	Which relation follows?	Symbols then SI values
Evaluation	Does it make sense?	Unit, sign and trend check

Make the idea concrete in Nepal

Connect the model to a school laboratory, household technology, health, environment, energy or local material. The example should clarify the science rather than merely mention a place. Compare a prediction with an observation and record uncertainty.

Review the NEB Class 11 Mathematics revision roadmap and the complete Mathematics guide. For online or physical tuition, call 9846662070.

Frequently asked questions

Questions students ask about Collinear and Coplanar Vectors

What is the central idea of Collinear and Coplanar Vectors?+

Which equation should I remember?+

a and b are collinear when a×b=0. Vectors a,b,c are coplanar when a·(b×c)=0.

How should I begin a numerical?+

Draw the situation, list known quantities in SI units, choose the governing relation symbolically, substitute once and finish with a unit and reasonableness check.

What is a common exam mistake?+

Comparing magnitudes only, treating parallel position vectors as the same geometric line without context, or expanding a determinant with sign errors.

How can I practise this topic?+

Alternate one concept explanation, one diagram and two numericals. Revisit errors after a day instead of only rereading the solution.

Where can I get tuition support?+

For online or physical KTM Tuition classes, call 9846662070. After Grade 12, the MKS Education panel below gives preparation and pre-counselling contacts.

References and next steps

Scope checked against CDC Nepal; concept support from an institutional reference and OpenStax Science. Continue with the Collinear and Coplanar Vectors cluster.

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