CBSE 12th Physics (Term 1) Paper 2021-22

MCQ (Single Correct Answer)

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A proton and an alpha particle move in circular orbits in a uniform magnetic field. Their speeds are in the ratio of 9 : 4. The ratio of radii of their circular orbits $$\left( {{{{r_p}} \over {{r_{alpha}}}}} \right)$$ is

$${3 \over 4}$$

$${4 \over 3}$$

$${8 \over 9}$$

$${9 \over 8}$$

CBSE 12th Physics (Term 1) Paper 2021-22

MCQ (Single Correct Answer)

+0.77

-0

Assertion (A) : When radius of a current carrying loop is doubled, its magnetic moment becomes four times.

Reason (R) : The magnetic moment of a current carrying loop is directly proportional to the area of the loop.

Both (A) & (R) are true and (R) is correct explanation of (A).

Both (A) & (R) are true and (R) is not correct explanation of (A).

(A) is true but (R) is false.

(A) is false and (R) is also false.

Class 12 Subjects

Physics

Electromagnetism

Electrostatics Current Electricity Capacitor Magnetic Effect of Current Magnetic Properties of Matter Electromagnetic Induction Alternating Current Electromagnetic Waves

Optics

Geometrical Optics Wave Optics

Modern Physics

Atoms and Nuclei Dual Nature of Radiation Semiconductor