1
JEE Main 2025 (Online) 22nd January Evening Shift
MCQ (Single Correct Answer)
+4
-1
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A series LCR circuit is connected to an alternating source of emf E. The current amplitude at resonant frequency is $I_0$. If the value of resistance R becomes twice of its initial value then amplitude of current at resonance will be

A
$\frac{\mathrm{I}_0}{2}$
B
$\frac{\mathrm{I}_0}{\sqrt{2}}$
C
$2 \mathrm{I}_0$
D
$\mathrm{I_0}$
2
JEE Main 2025 (Online) 22nd January Evening Shift
MCQ (Single Correct Answer)
+4
-1
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For a short dipole placed at origin O , the dipole moment P is along $x$-axis, as shown in the figure. If the electric potential and electric field at $A$ are $V_0$ and $E_0$, respectively, then the correct combination of the electric potential and electric field, respectively, at point B on the $y$-axis is given by

JEE Main 2025 (Online) 22nd January Evening Shift Physics - Electrostatics Question 31 English

A
$\frac{V_0}{2}$ and $\frac{E_0}{16}$
B
zero and $\frac{E_0}{8}$
C
$\mathrm{V}_0$ and $\frac{\mathrm{E}_0}{4}$
D
zero and $\frac{E_0}{16}$
3
JEE Main 2025 (Online) 22nd January Evening Shift
MCQ (Single Correct Answer)
+4
-1
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A transparent film of refractive index, 2.0 is coated on a glass slab of refractive index, 1.45. What is the minimum thickness of transparent film to be coated for the maximum transmission of Green light of wavelength 550 nm . [Assume that the light is incident nearly perpendicular to the glass surface.]

A
68.7 nm
B
137.5 nm
C
94.8 nm
D
275 nm
4
JEE Main 2025 (Online) 22nd January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

A light source of wavelength $\lambda$ illuminates a metal surface and electrons are ejected with maximum kinetic energy of 2 eV . If the same surface is illuminated by a light source of wavelength $\frac{\lambda}{2}$, then the maximum kinetic energy of ejected electrons will be (The work function of metal is 1 eV )

A
5 eV
B
3 eV
C
2 eV
D
6 eV
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