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The magnitude of force between two plates of a capacitor is Transformer works on.
A
B DC only
C Both and DC
D AC more effectively than DC
The correct option is A AC only Transformer works on the principle of Electromagnetic induction i.e an emf is induced in the coil if the magnetic flux linked with the coil changes. Magnetic flux in...
Force between two plates of a capacitor is :
A
B
C
D none of these
Correct option is B $\frac{\mathrm{Q}^{2}}{2 \mathrm{\varepsilon}_{0} \mathrm{~A}}$ The magnitude of electric field by any one plate is $\mathrm{E}=\frac{\sigma}{2...
Why is glass considered a super cooled liquid?
Ans: Similar to liquids, glass has a tendency to flow, though very slowly. Therefore, glass is considered as a super cooled liquid. This is the reason that glass windows and doors are slightly...
Quality factor of series resonance circuit is given by
A
B
c)
D
Correct option is D $\frac{\mathrm{f}_{0}}{\mathrm{f}_{2}-\mathrm{f}_{1}}$ Quality factor is a relation between stored energy and energy dissipation in a device or system. As per definition of...
What is Q-factor? Write its expression and write the conditions for its maximum value.
Q-factor: In LCR Circuit, the ratio of resonance frequency to the difference of its neighboring frequencies so that their corresponding current is $1 / \sqrt{2}$ times of the peak value, is called...
Why do solids have a definite volume?
Ans: The intermolecular forces of attraction that are present in solids are very strong, The constituent particles of solids have fixed positions i.e., they are rigid. Hence, solids have a definite...
Why are solids rigid?
Ans: The intermolecular forces of attraction that are present in solids are very strong. The constituent particles of solids cannot move from their positions i.e., they have fixed positions....
Using Biot-Savart’s law, obtain an expression for the magnetic field at a distance r meter from an infinitely long wire carrying a current of i ampere.
Biot savart law is the base of all magnetism and the effects of current. It states that the magnetic field intensity due to an element of a current-carrying wire at a point near the element is...
The principle on which transformer works is?
A Mutual induction
B Self induction
C Electromagnetic induction
D None of these
The correct option is A Mutual induction Mutual inductance is where the magnetic field generated by a coil of wire induces a voltage in an adjacent coil of wire. A transformer is a device...
$ Solid A is a very hard electrical insulator in solid as well as in molten state and melts at extremely high temperature. What type of solid is it?
Ans: The given properties are the properties of a covalent or network solid. Therefore, the given solid is a covalent or network solid. Examples of such solids include diamond ( $\mathrm{C}$ ) and...
A transformer is
A) A device for stepping up D.C.
B )A generator of current
C) Device for converting direct current into alternating current
D) A device for stepping up or down the voltage of . supply
The correct option is D) A device for stepping up or down the voltage of $A C$. supply A transformer is a device that is used to either raise or lower voltages and currents in an electrical circuit....
Classify the following solids in different categories based on the nature of intermolecular forces operating in them: Potassium sulphate, tin, benzene, urea, ammonia, water, zinc sulphide, graphite, rubidium, argon, silicon carbide.
Ans: Potassium sulphate $\rightarrow$ ionic solid Tin Metallic $\rightarrow$ solid Benzene $\rightarrow$ Molecular (non-polar) solid Urea $\rightarrow$ Polar molecular solid Ammonia $\rightarrow$...