List of top Physics Questions

The equivalent resistance of the following combination of resistances between \(A\) and \(C\) is:

A wire carrying current \(i\), bent as shown in the figure, is placed in a uniform magnetic field \(B\) directed normally out of the plane of the figure. The force on the wire is:

If a straight wire of length \(175\,\text{cm}\) and mass \(250\,\text{g}\) is suspended freely in a uniform horizontal magnetic field of \(0.7\,\text{T}\), then the current flowing through the wire is:

A straight wire of mass \(500\,\text{g}\) and length \(7\,\text{m}\) carries a current of \(1.4\,\text{A}\). It is suspended in mid-air by a uniform horizontal magnetic field \(B\) perpendicular to the length of the wire. The magnitude of the magnetic field is:

Five resistors, each of resistance \(R\), are connected between points \(A\) and \(B\) as shown in the figure. The equivalent resistance between \(A\) and \(B\) is:

In the figure shown, three resistors of \(4\,\Omega\) are connected. If point \(D\) divides the resistor between \(B\) and \(C\) into two equal parts, then the equivalent resistance between points \(A\) and \(D\) is:

If \(\alpha, \beta\) are the roots of the equation \(x^{2}-px+q=0\) and \(\alpha>0\), \(\beta>0\), then \[ \alpha^{\frac{1}{4}}+\beta^{\frac{1}{4}}=(p+6\sqrt{q}+4q^{\frac{1}{4}}\sqrt{p+2\sqrt{q}})^{\kappa}, \] where \(\kappa\) is:

A straight wire loop carrying a current \( I \) sits flat inside a uniform, external magnetic field \( \vec{B} \). Under what orientation angle \( \theta \) between the normal vector of the loop surface and the magnetic field lines will the loop experience maximum torque?

Which segment of the electromagnetic wave spectrum is primarily used in line-of-sight radar systems for aircraft navigation and to cook food inside kitchen appliances?

Two long, straight parallel wires separated by a distance \( r \) carry steady currents \( I_1 \) and \( I_2 \) in the exact same direction. What type of magnetic force interaction do they experience?

A parallel-plate air capacitor has an initial capacitance value of \( 8\,\mu\text{F} \). If the space between the plates is completely filled with a solid dielectric slab having a dielectric constant \( K = 5 \), what will the new capacitance value of the component be?

An alternating current source driving a circuit is represented by the voltage equation \( V = 220\sqrt{2}\sin(100\pi t) \). What are the Root Mean Square (RMS) voltage value \( V_{\text{rms}} \) and the alternating frequency \( f \) of this source supply?

In a moving coil galvanometer, the pole pieces of the permanent magnet are systematically sculpted into a cylindrical shape to create a radial magnetic field. What is the primary operational purpose of applying this radial field configuration?

A galvanometer has a resistance of \( 50\,\Omega \) and gives a full-scale deflection for a current of \( 2\,\text{mA} \). To convert this galvanometer into an ammeter capable of measuring currents up to \( 2\,\text{A} \), what is the value of the shunt resistance that must be connected in parallel with it?

In a Young's Double Slit Experiment (YDSE), the separation between the two coherent slits is halved, and the perpendicular distance between the plane of the slits and the viewing screen is doubled. If the initial fringe width was \( \beta \), what will the new modified fringe width \( \beta' \) be?

The electric and magnetic field vectors of a plane electromagnetic wave propagating along the positive x-axis are represented by \( \vec{E} \) and \( \vec{B} \) respectively. Which of the following vector expressions correctly defines the direction of propagation of this wave?

When an external operating bias voltage is applied to a standard P-N junction semiconductor diode under a forward bias configuration, how do the width of the internal depletion region and the height of the contact barrier potential change?

What is the ratio of the shortest wavelength present in the Lyman series of hydrogen spectral emissions to the shortest wavelength present in the Balmer series?

An object is placed at a distance of $20\,\text{cm}$ in front of a concave mirror of focal length $15\,\text{cm}$. What is the nature and magnification ($m$) of the image produced by the mirror?}

In a series $LCR$ circuit connected to an AC source of variable frequency, the values are given as $L = 2\,\text{H}$, $C = 32\,\mu\text{F}$, and $R = 10\,\Omega$. What is the resonant angular frequency $\omega_r$ of this circuit system?}

A straight metallic rod of length $L$ is oriented horizontally and dropped vertically downward with a speed $v$ perpendicular to the horizontal component of the Earth's uniform magnetic field $B_H$. The instantaneous motional electromotive force (EMF) induced across the two ends of this rod is:

A material specimen exhibits a small, negative magnetic susceptibility ($\chi < 0$) at room temperature. When placed inside a non-uniform magnetic field, this specimen experiences a net force pushing it. How will this material behave?

A particle carrying a positive charge $q$ moves with a velocity vector $\vec{v} = v\hat{i}$ into a uniform magnetic field region specified by $\vec{B} = B\hat{j}$. What is the vector direction of the magnetic Lorentz force acting on this particle at that instant?}

Three point charges $+q$, $+q$, and $-q$ are placed at the vertices of an equilateral triangle of side length $L$. The net electrostatic potential energy of this system of charges is given by: