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How the frequency of the vibrating wire is affected if the load is fully immersed in water?
Concept: Study of Vibrations of Air Columns
Show that even as well as odd harmonics are present as an overtone in modes of vibration of the string.
Concept: Free and Forced Vibrations
Waves produced by two vibrators in a medium have wavelength 2 m and 2.1 m respectively. When sounded together they produce 8 beats/second. Calculate wave velocity and frequencies of the vibrators.
Concept: Study of Vibrations of Air Columns
A dipole is placed in a uniform electric field, its potential energy will be minimum when the angle between its axis and field is ______
Concept: Electrical Energy of Two Point Charges and of a Dipole in an Electrostatic Field
If an electron is brought towards another electron, the electric potential energy of the system ______.
Concept: Electric Potential and Potential Difference
Which physical quantity has its unit as J/C? Is it a scalar or vector?
Concept: Electric Potential and Potential Difference
Obtain an expression for the capacitance of a parallel plate capacitor without a dielectric.
Concept: Concept of Electrostatics
Three-point charges +q, +2q and Q are placed at the three vertices of an equilateral triangle. Find the value of charge Q (in terms of q), so that the electric potential energy of the system is zero.
Concept: Electric Potential and Potential Difference
The angle at which maximum torque is exerted by the external uniform electric field on the electric dipole is ______.
Concept: Electrical Energy of Two Point Charges and of a Dipole in an Electrostatic Field
State the formula giving the relation between electric field intensity and potential gradient.
Concept: Electric Potential and Potential Difference
An electric dipole consists of two opposite charges each of magnitude 1 μC, separated by 2 cm. The dipole is placed in an external electric field of 105 N/C. Calculate the:
- maximum torque experienced by the dipole and
- work done by the external field to turn the dipole through 180°.
Concept: Electrical Energy of Two Point Charges and of a Dipole in an Electrostatic Field
Derive an expression for energy stored in a capacitor.
Concept: Energy Stored in a Charged Capacitor
The work done in bringing a unit positive charge from infinity to a given point against the direction of electric field is known as ______.
Concept: Electric Potential Due to a Point Charge
A spherical metal ball of radius 15 cm carries a charge of 2μC. Calculate the electric field at a distance of 20 cm from the center of the sphere.
Concept: Application of Gauss' Law
Define emissive power and coefficient of emmision of a body.
Concept: Temperature and Heat
For polyatomic molecules having 'f' vibrational modes, the ratio of two specific heats,Cp/Cv is..........
Concept: Law of Equipartition of Energy
A metal sphere cools at the rate of 4°C / min. when its temperature is 50°C. Find its rate of cooling at 45°C if the temperature of surroundings is 25°C.
Concept: Temperature and Heat
The combined resistance of a galvanometer of resistance 500Ω and its shunt is 21Ω. Calculate the value of shunt.
Concept: Moving Coil Galvanometer
Two copper spheres of radii 6 cm and 12 cm respectively are suspended in an evacuated enclosure. Each of them are at a temperature 15°C above the surroundings. The ratio of their rate of loss of heat is.................
- 2:1
- 1:4
- 1:8
- 8:1
Concept: Temperature and Heat
The dimensions of emissive power are ______.
Concept: Temperature and Heat
