1
CBSE 12th Physics Delhi Set 1 - 2024
MCQ (Single Correct Answer)
+1
-0

Assertion (A): The energy of a charged particle moving in a magnetic field does not change.

Reason (R): It is because the work done by the magnetic force on the charge moving in a magnetic field is zero.

A
If both Assertion (A) and Reason (R) are true and Reason (R) is correct explanation of Assertion (A).
B
If both Assertion (A) and Reason (R) are true and Reason (R) is not the correct explanation of Assertion (A).
C
If Assertion (A) is true but Reason (R) is false.
D
If both Assertion (A) and Reason (R) are false.
2
CBSE 12th Physics Delhi Set 1 - 2024
MCQ (Single Correct Answer)
+1
-0

Assertion (A): In a Young's double-slit experiment, interference pattern is not observed when two coherent sources are infinitely close to each other.

Reason (R): The fringe width is proportional to the separation between the two sources.

A
If both Assertion (A) and Reason (R) are true and Reason (R) is correct explanation of Assertion (A).
B
If both Assertion (A) and Reason (R) are true and Reason (R) is not the correct explanation of Assertion (A).
C
If Assertion (A) is true but Reason (R) is false.
D
If both Assertion (A) and Reason (R) are false.
3
CBSE 12th Physics Delhi Set 1 - 2024
MCQ (Single Correct Answer)
+1
-0

Assertion (A): An alpha particle is moving towards a gold nucleus. The impact parameter is maximum for the scattering angle of $180^{\circ}$.

Reason (R): The impact parameter in an alpha particle scattering experiment does not depend upon the atomic number of the target nucleus.

A
If both Assertion (A) and Reason (R) are true and Reason (R) is correct explanation of Assertion (A).
B
If both Assertion (A) and Reason (R) are true and Reason (R) is not the correct explanation of Assertion (A).
C
If Assertion (A) is true but Reason (R) is false.
D
If both Assertion (A) and Reason (R) are false.
4
CBSE 12th Physics Delhi Set 1 - 2024
Subjective
+2
-0

(a) Four point charges of $1 \mu \mathrm{C},-2 \mu \mathrm{C}, 1 \mu \mathrm{C}$ and $-2 \mu \mathrm{C}$ are placed at the corners $\mathrm{A}, \mathrm{B}, \mathrm{C}$ and D respectively, of a square of side 30 cm . Find the net force acting on a charge of $4 \mu \mathrm{C}$ placed at the centre of the square.

OR

(b) Three point charges, 1 pC each, are kept at the vertices of an equilateral triangle of side 10 cm . Find the net electric field at the centroid of triangle.

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