CBSE Class 12 · Physics

Electrostatics and Electromagnetism

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Two point charges placed in vacuum repel each other with a force of $F$ . If they are placed at the same separation in a dielectric medium of dielectric constant $K = 4$ , what is the new electrostatic…
For a short electric dipole of dipole moment $p$ , how does the magnitude of the electric field at a distance $r$ along its axial line vary with $r$ ?
A point charge $q$ is situated at the exact geometric center of a closed cube of side $L$ . What is the total electric flux passing through one face of the cube?
A parallel plate capacitor of capacitance $C_{0}$ is charged by a battery to potential $V_{0}$ and then disconnected from the battery. A dielectric slab of constant $K = 5$ is then inserted between the pl…
If the potential difference applied across a metallic wire of length $L$ is doubled while keeping its temperature constant, what happens to the drift velocity of free electrons in the wire?
In a balanced Wheatstone bridge network, the four arms have resistances $P = 10 Ω$ , $Q = 20 Ω$ , $R = 15 Ω$ , and $S$ . What is the value of the unknown resistance $S$ ?
Kirchhoff's first rule (junction rule) at an electrical node is a consequence of which conservation law?
A circular loop of radius $R$ carries steady current $I$ . At what axial distance $x$ from the center of the loop is the magnetic field equal to $\frac{1}{8}$ of its value at the center?
A charged particle moves with velocity $v$ through a region having a uniform magnetic field $B$ . Under which condition is the magnetic Lorentz force acting on the particle strictly z…
The orbital frequency of a charged particle undergoing uniform circular motion in a magnetic field (cyclotron frequency) is independent of which quantity?
An ideal long solenoid has $n$ turns per unit length and carries steady current $I$ . What is the magnitude of the magnetic field inside the solenoid near its center?
A magnetic material has a small, negative magnetic susceptibility ( $- 1 0^{- 5} \leq χ < 0$ ). To which class of magnetic substances does it belong?
Lenz's law of electromagnetic induction is a direct manifestation of which fundamental conservation principle?
If the number of turns in a long air-cored solenoid is tripled while keeping its length and cross-sectional area constant, what happens to its self-inductance?
The peak voltage of an alternating household power supply is $V_{0} = 311 V$ . What is the root-mean-square (RMS) voltage of this AC supply?
A series LCR circuit has inductor $L = 0.1 H$ , capacitor $C = 10 μ F$ , and resistor $R = 25 Ω$ . What is the resonant angular frequency $ω_{0}$ of the circuit?
An ideal step-up transformer has a turns ratio $N_{s} / N_{p} = 5$ . If an alternating input voltage of $100 V$ and input power of $500 W$ are supplied, what are the output voltage and outp…
In a plane electromagnetic wave propagating along the $+ x$ -direction, the electric field oscillates along the $y$ -axis. Along which axis does the magnetic field oscillate?
Which part of the electromagnetic spectrum is widely used in radar systems for aircraft navigation?
A biconvex lens made of glass ( $μ = 1.5$ ) has radii of curvature of magnitude $R_{1} = 20 cm$ and $R_{2} = 20 cm$ . What is the focal length of this lens in air?

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Electrostatics and Electromagnetism

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