Assertion(A): In uniform circular motion the particle has zero acceleration.
Reason (R) : Centripetal force is essential to keep a particle in circular motion.

Both A and R are true and R is correct explanation of A

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Both A and R are true and R is not correct explanation of A

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A is true and R is false

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A is false and R is true

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Solution

The correct option is B A is false and R is true
In uniform circular motion, the magnitude of the acceleration is constant but direction always keeps on changing, which results in non zero acceleration.
When a particle moves in a circular motion, centripetal force is always acted upon it.

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Reason : $B q v = \frac{m v^{2}}{r}$ holds good for the charged particle moving in a circular path in a uniform magnetic field.

Choose the most appropriate correct option:

Q. (i)
Assertion: A circle is not a rectilinear figure.
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(ii)
Assertion: All right angles are equal to one another.
Reason: A unique line passes through a single point.
(a) Both Assertion and Reason are true and Reason is a correct explanation of Assertion.
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(c) Assertion is true and Reason is false.
(d) Assertion is false and Reason is true.

Q. Assertion: A cyclic parallelogram is a square.
Reason: Diameter is the largest chord in a circle.
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(b) Both Assertion and Reason are true but Reason is not a correct explanation of Assertion.
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Q. Assertion: Ray

\underset{A B}{\to}

has one end-point A.
Reason: Line segment

A B

has two end-points A and B.
(a) Both Assertion and Reason are true and Reason is a correct explanation of Assertion.
(b) Both Assertion and Reason are true but Reason is not a correct explanation of Assertion.
(c) Assertion is true and Reason is false.
(d) Assertion is false and Reason is true.

Q. Assertion: If acceleration of a particle moving in a straight line varies as

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Assertion(A): In uniform circular motion the particle has zero acceleration.Reason (R) : Centripetal force is essential to keep a particle in circular motion.

The correct option is B A is false and R is trueIn uniform circular motion, the magnitude of the acceleration is constant but direction always keeps on changing, which results in non zero acceleration.When a particle moves in a circular motion, centripetal force is always acted upon it.

Assertion(A): In uniform circular motion the particle has zero acceleration.
Reason (R) : Centripetal force is essential to keep a particle in circular motion.

The correct option is B A is false and R is true
In uniform circular motion, the magnitude of the acceleration is constant but direction always keeps on changing, which results in non zero acceleration.
When a particle moves in a circular motion, centripetal force is always acted upon it.