Q27.A point source of light S , placed at a distance 60 cm infront of the centre of a plane mirror of width 50 cm, hangs vertically on a wall. A man walks infront of the mirror along a line parallel to the mirror at a distance 1. 2 m from it (see in the figure). The distance between the extreme points where he can see the image of the light source in the mirror is__ cm
What This Question Tests
This question combines the principles of charge and volume conservation when identical drops merge, and then requires calculating the ratio of potential energies.
Concepts Tested
Formulas Used
V = kQ/r
U = (1/2)QV = (1/2)kQ²/r
Q_total = nQ_small
V_big = n V_small
📚 NCERT Sections This Tests
9.1 — A Small Candle, 2.5 Cm In Size Is Placed At 27 Cm In Front Of A Concave
Physics Class 12 · Chapter 9
9.1 A small candle, 2.5 cm in size is placed at 27 cm in front of a concave mirror of radius of curvature 36 cm. At what distance from the mirror should a screen be placed in order to obtain a sharp image? Describe the nature and size of the image. If the candle is moved closer to the mirror, how would the screen have to be moved?
10.2 — What Is The Shape Of The Wavefront In Each Of The Following Cases:
Physics Class 12 · Chapter 10
10.2 What is the shape of the wavefront in each of the following cases: (a) Light diverging from a point source. (b) Light emerging out of a convex lens when a point source is placed at its focus. (c) The portion of the wavefront of light from a distant star intercepted by the Earth.
2.4 — A Spherical Conductor Of Radius 12 Cm Has A Charge Of 1.6 × 10–7C
Physics Class 11 · Chapter 2
2.4 A spherical conductor of radius 12 cm has a charge of 1.6 × 10–7C distributed uniformly on its surface. What is the electric field (a) inside the sphere (b) just outside the sphere (c) at a point 18 cm from the centre of the sphere?
📋 Question Details
- Chapter
- Electrostatics
- Topic
- Potential of conducting spheres
- Year
- 2021
- Shift
- 26 Feb Shift 2
- Q Number
- Q27
- Type
- Numerical
- NCERT Ref
- Class 12 Physics Ch 2: Electrostatic Potential and Capacitance
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