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Byju's Answer

Standard XII

Physics

Work Energy Theorem Application

Assertion :A ...

Question

Assertion :A charged particle is moving in a circular path under the action of uniform magnetic field as shown in fig. During motion kinetic energy of charged particle is constant. Reason: During the motion, magnetic force acting on the particle is perpendicular to instantaneous velocity.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
$\to F = q (\to v \times \to B)$
$\Rightarrow \to F ⊥ \to v$
$\Rightarrow \to F . \to v = 0$ since both are perpendicular to each other
$\Rightarrow K E = c o n s t a n t$

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Similar questions

Assertion: A proton and an $α$ - particle are projected with the same kinetic energy at right angle to a uniform magnetic field, then the $α$ - particle will move along a circular path of smaller radius than the proton.

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. Assertion: Average kinetic energy in one oscillation during

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Assertion (A) Rate constant determined from Arrhenius equation are fairly accurate for simple as well as complex molecules.

Reason (R) Reactant molecules undergo chemical change irrespective of their orientation during collision.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

Assertion (A) All collision of reactant molecules lead to product formation.

Reason (R) Only those collisions in which molecules have correct orientation and sufficient kinetic energy lead to compound formation.

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Assertion :A charged particle is moving in a circular path under the action of uniform magnetic field as shown in fig. During motion kinetic energy of charged particle is constant. Reason: During the motion, magnetic force acting on the particle is perpendicular to instantaneous velocity.

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion→F=q(→v×→B)⇒→F⊥→v⇒→F.→v=0 since both are perpendicular to each other⇒KE=constant

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
$\to F = q (\to v \times \to B)$
$\Rightarrow \to F ⊥ \to v$
$\Rightarrow \to F . \to v = 0$ since both are perpendicular to each other
$\Rightarrow K E = c o n s t a n t$