Physics-
General
Easy
Question
ABC is an equilateral triangle. Charges +q are placed at each corner. The electric intensity at O will be
- Zero
The correct answer is: Zero
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Figure shows the electric lines of force emerging from a charged body. If the electric field at A and B are 
and 
respectively and if the displacement between A and B is r then
Figure shows the electric lines of force emerging from a charged body. If the electric field at A and B are and respectively and if the displacement between A and B is r then
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The electric field inside a spherical shell of uniform surface charge density is
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The ratio of electrostatic and gravitational forces acting between electron and proton separated by a distance 
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When a glass rod is rubbed with silk, it
When a glass rod is rubbed with silk, it
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Three charges are placed at the vertices of an equilateral triangle of side ‘a’ as shown in the following figure. The force experienced by the charge placed at the vertex A in a direction normal to BC is
Three charges are placed at the vertices of an equilateral triangle of side ‘a’ as shown in the following figure. The force experienced by the charge placed at the vertex A in a direction normal to BC is
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A solid conducting sphere of radius a has a net positive charge 2Q. A conducting spherical shell of inner radius b and outer radius c is concentric with the solid sphere and has a net charge – Q. The surface charge density on the inner and outer surfaces of the spherical shell will be
A solid conducting sphere of radius a has a net positive charge 2Q. A conducting spherical shell of inner radius b and outer radius c is concentric with the solid sphere and has a net charge – Q. The surface charge density on the inner and outer surfaces of the spherical shell will be
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Charge on 
-particle is
Charge on -particle is
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When air is replaced by a dielectric medium of constant k, the maximum force of attraction between two charges separated by a distance
When air is replaced by a dielectric medium of constant k, the maximum force of attraction between two charges separated by a distance
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Dielectric constant of pure water is 81. Its permittivity will be
Dielectric constant of pure water is 81. Its permittivity will be
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Four charges are arranged at the corners of a square ABCD, as shown in the adjoining figure. The force on the charge kept at the centre O is
Four charges are arranged at the corners of a square ABCD, as shown in the adjoining figure. The force on the charge kept at the centre O is
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An engine approaches a hill with a constant speed. When it is at a distance of 0.9 km it blows a whistle, whose echo is heard by the driver after 5 sec. If speed of sound in air is 330 m/s, the speed of engine is
An engine approaches a hill with a constant speed. When it is at a distance of 0.9 km it blows a whistle, whose echo is heard by the driver after 5 sec. If speed of sound in air is 330 m/s, the speed of engine is
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The fundamental frequency of a closed pipe is 220 Hz. If 
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The fundamental frequency of a closed pipe is 220 Hz. If of the pipe is filled with water, the frequency of the first overtone of the pipe now is
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Two trains, one coming towards and another going away from an observer both at 4 m/s produce whistle simultaneously of frequency 300 Hz. Find the number of beats produced
Two trains, one coming towards and another going away from an observer both at 4 m/s produce whistle simultaneously of frequency 300 Hz. Find the number of beats produced
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An Indian submarine and an enemy submarine move towards each other during maneuvers in motionless water in the Indian ocean. The Indian submarine moves at 50 km/h, and the enemy submarine at 70 km/h. The Indian sub sends out a sonar signal (sound wave in water) at 1000 Hz. Sonar waves travel at 5500 km/h. What is the frequency detected by the Indian submarine
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A sound wave of wavelength 32 cm enters the tube at S as shown in the figure. Then the smallest radius r so that a minimum of sound is heard at detector D is
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