CBSE Class 12 Physics 2025 Sample Paper Solved Set 7

SECTION-A

Q2 Two uniformly charged spherical conductors A and B of radii 5 mm and 10 mm are separated by a distance of 2 cm. If the spheres are connected by a conducting wire, then in equilibrium condition, the ratio of the magnitude of electric fields at the surface of the spheres A and B will be
(A) 1:2
(B) 2:1
(C) 1:1
(D) 1:4

Q3 In a parallel plate capacitor with air between the plates, each plate has an area of 6 X 10^-3 m²and the distance between the plates is 3 mm. The capacitance of the capacitor will be
(A) 16 pF
(B) 18 pF
(C) 20 pF
(D) 0 pF

Q4 An electric current is passed through a circuit containing two wires of same material, connected in parallel. If the lengths and radii of the wires are in the ratio of 3:2 and 2:3, then the ratio of the current passing through the wires
(A) 2:3
(B) 3:2
(C) 8:27
(D) 27:8

Q5 Two wires of the same length are shaped into a square of side ‘a’ and a circle with radius ‘r’. If they carry same current, the ratio of their magnetic moment is
(A) 2 : π
(B) π : 2
(C) π :4
(D) 4 : π

Q6 In a series LCR circuit, the capacitance is changed from C to C/4. For the resonant frequency to remain unchanged, the inductance should be changed from L to nL, where n is
(A) 1/2 
(B) 2
(C) 4
(D) 1/4

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