1
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.
2
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.

3
CBSE 12th Physics Delhi Set 1 - 2024
Subjective
+2
-0

Derive an expression for magnetic force $\vec{F}$ acting on a straight conductor of length $L$ carrying current I in an external magnetic field $\vec{B}$. Is it valid when the conductor is in zig-zag form? Justify.

4
CBSE 12th Physics Delhi Set 1 - 2024
Subjective
+2
-0

A telescope has an objective lens of focal length 150 cm and an eyepiece of focal length 5 cm . Calculate its magnifying power in normal adjustment and the distance of the image formed by the objective.

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