Day 122: JEE Mains Physics

Current Electricity. This type asked 2 times: 29 Jul 2022, 22 Jan 2025. This one: 22 Jan 2025 See all 2 of this type

Electrostatics. This type asked 2 times: 5 Apr 2024, 22 Jan 2025. This one: 22 Jan 2025 See all 2 of this type

80

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

1. A.
   $\frac{V_{0}}{2}$ and $\frac{E_{0}}{16}$
2. B.
   zero and $\frac{E_{0}}{8}$
3. C.
   zero and $\frac{E_{0}}{16}$
4. D.
   $V_{0}$ and $\frac{E_{0}}{4}$

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Gravitation. This type asked 2 times: 2021 Paper 3, 22 Jan 2025. This one: 22 Jan 2025 See all 2 of this type

13

A small point of mass $m$ is placed at a distance $2R$ from the centre ' $O$ ' of a big uniform solid sphere of mass M and radius R . The gravitational force on ' $m$ ' due to $M$ is $F_{1}$. A spherical part of radius $R/3$ is removed from the big sphere as shown in the figure and the gravitational force on $m$ due to remaining part of M is found to be $F_{2}$. The value of ratio $F_{1}:F_{2}$ is

1. A.
   $16:9$
2. B.
   $11:10$
3. C.
   $12:11$
4. D.
   $12:9$

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Ray Optics. This type asked 2 times: 2021 Paper 18, 22 Jan 2025. This one: 22 Jan 2025 See all 2 of this type

Semiconductor Electronics. This type asked 2 times: 27 Jan 2024, 22 Jan 2025. This one: 22 Jan 2025 See all 2 of this type

18

Which of the following circuits represents a forward biased diode? (A) p-side at $-10\ V$, n-side at $0\ V$ (B) p-side at $-10\ V$, n-side at $-15\ V$ (C) p-side at $4\ V$, n-side at $2\ V$ (D) p-side at $-10\ V$, n-side at $-5\ V$ (E) p-side at $2\ V$, n-side earthed ($0\ V$) Choose the correct answer from the options given below :

1. A.
   (B), (D) and (E) only
2. B.
   (A) and (D) only
3. C.
   (B), (C) and (E) only
4. D.
   (C) and (E) only

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