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Questions and Answers
What is the reason for using Constantan wire in making standard resistance?
What is the reason for using Constantan wire in making standard resistance?
- Negligible temperature coefficient of resistance (correct)
- High melting point
- Low specific resistance
- High specific resistance
In an electric dipole placed in a non-uniform electric field, what does it experience?
In an electric dipole placed in a non-uniform electric field, what does it experience?
- Only a torque but no force
- Neither a force nor a torque
- Only a force but not a torque
- A force and a torque (correct)
When two resistors of 6Ω and 9Ω are connected in series to a 120V source, what is the power consumed by the 6Ω resistor?
When two resistors of 6Ω and 9Ω are connected in series to a 120V source, what is the power consumed by the 6Ω resistor?
- 384 W
- 1500 W
- 616 W (correct)
- 1800 W
If a 100W bulb operates at 200V and has resistance R, and a 200W bulb operates at 100V with resistance S, what is the ratio R/S?
If a 100W bulb operates at 200V and has resistance R, and a 200W bulb operates at 100V with resistance S, what is the ratio R/S?
Which graph best represents ohmic resistance?
Which graph best represents ohmic resistance?
If two wires of the same material have radii in the ratio 1:2 and carry current in the ratio 4:1, what is the ratio of drift speed of electrons in the two wires?
If two wires of the same material have radii in the ratio 1:2 and carry current in the ratio 4:1, what is the ratio of drift speed of electrons in the two wires?
What is the ratio of the initial charges on the two identical conducting spheres that, when brought into contact and then separated, exhibit a repulsive force equal in magnitude to the original attractive force?
What is the ratio of the initial charges on the two identical conducting spheres that, when brought into contact and then separated, exhibit a repulsive force equal in magnitude to the original attractive force?
What is the SI unit of electric flux?
What is the SI unit of electric flux?
When a parallel plate air capacitor is half filled with a dielectric of dielectric constant 5, what is the percentage increase in capacitance?
When a parallel plate air capacitor is half filled with a dielectric of dielectric constant 5, what is the percentage increase in capacitance?
In an equilateral triangle with charges placed at its vertices, what is the force experienced by the charge situated at vertex A in a direction normal to BC?
In an equilateral triangle with charges placed at its vertices, what is the force experienced by the charge situated at vertex A in a direction normal to BC?
In a cube where each corner has a negative charge of -q, what is the electrostatic potential energy of a charge q placed at the center of the cube?
In a cube where each corner has a negative charge of -q, what is the electrostatic potential energy of a charge q placed at the center of the cube?
The electric potential at a point on the x-y plane given by V = -kxy signifies ______.
The electric potential at a point on the x-y plane given by V = -kxy signifies ______.
What is the phase angle of the circuit when an inductance of $rac{1}{rac{3}{4}}$ mH, a capacitance of $rac{3}{4}$ F, and a resistance of 10$ ext{Ω}$ are connected in series to an a.c. source of 220V and 50Hz?
What is the phase angle of the circuit when an inductance of $rac{1}{rac{3}{4}}$ mH, a capacitance of $rac{3}{4}$ F, and a resistance of 10$ ext{Ω}$ are connected in series to an a.c. source of 220V and 50Hz?
In a circuit with a resistor of 30$ ext{Ω}$, inductor of reactance 10$ ext{Ω}$, and capacitor of reactance 10$ ext{Ω}$ connected in series to an a.c. voltage source $e = 300 ext{V} \times 2 \sin(\omega t)$, what is the current in the circuit?
In a circuit with a resistor of 30$ ext{Ω}$, inductor of reactance 10$ ext{Ω}$, and capacitor of reactance 10$ ext{Ω}$ connected in series to an a.c. voltage source $e = 300 ext{V} \times 2 \sin(\omega t)$, what is the current in the circuit?
If a transformer with an input of 220V has an efficiency of 80% and draws a current of 2.0A at 440V output, what is the current drawn by the primary winding?
If a transformer with an input of 220V has an efficiency of 80% and draws a current of 2.0A at 440V output, what is the current drawn by the primary winding?
For an electromagnetic wave with electric field components $E_x = 0$, $E_y = 2.5 ext{ N C}^{-1} imes \cos(2 ext{π} \times 10^6 ext{ rad m}^{-1} t - ext{π} \times 10^{-2} ext{ rad s}^{-1} x)$, and $E_z = 0$, what are the characteristics of the wave?
For an electromagnetic wave with electric field components $E_x = 0$, $E_y = 2.5 ext{ N C}^{-1} imes \cos(2 ext{π} \times 10^6 ext{ rad m}^{-1} t - ext{π} \times 10^{-2} ext{ rad s}^{-1} x)$, and $E_z = 0$, what are the characteristics of the wave?
If a thin glass lens with a refractive index of 1.5 has an optical power of -5D in air, what will be its optical power in a liquid medium with refractive index 1.6?
If a thin glass lens with a refractive index of 1.5 has an optical power of -5D in air, what will be its optical power in a liquid medium with refractive index 1.6?
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