List of top Physics Questions

If current of 4 A produces magnetic flux of \(3\times 10^{-3}\) Wb through a coil of 400 turns, the energy stored in the coil will be
In an LCR series circuit, the potential difference across the terminals of the inductor, capacitor and resistor is 60 V, 30 V and 40 V respectively. Then supply voltage will be equal to
In the series LCR circuit shown in figure the impedance is
Two wires with current 3A and 1.5A are enclosed in a circular loop P. Third parallel wire with current 1A is situated outside the loop as shown. All the wires are perpendicular to the plane of the circular loop. The value of \(\oint \overset{⃗}{B}\cdot \overset{⃗}{dl}\) around the loop is (\(μ_0 =\) permeability of free space)
When cell of E.M.F. '\(E_1\)' is connected to potentiometer wire the balancing length is '\(l_1\)'. Another cell of E.M.F. '\(E_2\)' (\(E_1 > E_2\)) is connected along with \(E_1\) so as two cells oppose each other, the balancing length is '\(l_2\)'. The ratio \(E_1:E_2\) is
A particle of charge '\(q\)' and mass '\(m\)' moves in a circular orbit of radius '\(r\)' with angular speed '\(ω\)'. The ratio of the magnitude of its magnetic moment to that of its angular momentum depends upon
A straight long wire is carrying current I. The ratio of magnetic field due to this wire at perpendicular distance 2 cm and 5 cm respectively from the wire is
In the following network,
\(I_1 = -0.4\,\text{A}\) , \(I_4 = 1\,\text{A}\) , \(I_5 = 0.4\,\text{A}\)
The values of \(I_2\), \(I_3\) and \(I_6\) are respectively
Three point charges Q, \(+2q\) and \(+q\) are placed at the vertices of a right-angled isosceles triangle of length \(\sqrt{2}a\) as shown in figure. The net electrostatic potential energy of the configuration is zero, if Q is equal to
A wire of length 'L' and linear density 'm' is stretched between two rigid supports with tension 'T'. It is observed that wire resonates in the \(P^{th}\) harmonic at a frequency of 320 Hz and resonates again at next higher frequency of 400 Hz in two successive modes. The value of 'P' is
Three identical capacitors connected in series have net capacitance '\(x\)'. Then they are connected in parallel. The ratio of energy stored in series configuration to that in parallel configuration is (if both configurations are connected to the same source)
Two equal point charges exert a force F on each other when they are placed distance 'd' apart in air. When they are placed distance 'D' apart in a medium of dielectric constant K, they exert the same force. The distance D is equal to
A person standing between two parallel cliffs fires a gun and hears two echoes, first echo after 1 second and second echo after 3 second. The distance between the two cliffs is (The velocity of sound \(= 330\) m/s)
Figure shows a network of five capacitors connected to a supply voltage 'V'. The equivalent capacitance and the energy stored in the network is respectively
In an organ pipe closed at one end produces a fundamental note of frequency '\(ν\)'. The pipe is cut into two pipes of equal length. The fundamental frequencies produced in the two pipes are
Two particles A and B of equal masses are suspended from two massless springs of spring constants \(K_A\) and \(K_B\) respectively. The maximum velocities of the particles during oscillations are equal. The ratio of the amplitude of 'B' to that of 'A' is
A particle of mass '\(m\)' is executing S.H.M. about the origin on x-axis with frequency \(\sqrt{\frac{Ka}{πm}}\), where K is a constant and a is the amplitude of S.H.M. If '\(x\)' is the displacement of a particle at time '\(t\)', the potential energy of a particle will be
Three masses 100g, 300g and 500g are suspended at the end of a spring as shown in figure and are in equilibrium. When the 500 g mass is removed, the system oscillates with a period of 3 second. When the 300 g mass is also removed, it will oscillate with a period of
The fundamental frequency '\(n\)' of the tuning fork is 288 Hz, it will not resonate with the frequency
When the r.m.s. velocity of a gas is denoted by '\(v\)' at temperature '\(T\)'. Out of the following relations, the true one is
At a pressure P and temperature T, 7 gram of oxygen occupies a volume V. The equation of state will be (Molecular weight of Oxygen \(= 32\))
An ideal gas with pressure P, volume V and temperature T is expanded isothermally to volume 2V and a final pressure \(P_i\). The same gas is expanded adiabatically to a volume 2V then the final pressure is \(P_a\). In terms of \(γ\), the ratio of the two specific heats for the gas, the ratio \(P_i/P_a\) is
An ideal monoatomic gas is taken around the cycle ABCDA as shown in the P.V diagram. The work done during the cycle is
A body cools from a temperature \(3θ\) to \(2θ\) in 10 minute. The room temperature is \(θ\). The temperature of the body at the end of the next 10 minute is '\(x\)'. Assuming that Newton's law of cooling is applicable, the value of '\(x\)' will be
A black body radiates maximum energy at wavelength '\(λ\)' at temperature \(T_1\) and its emissive power is E. When the temperature of the body is changed to \(T_2\), it radiates maximum energy at wavelength \(\frac{2λ}{3}\), then the emissive power will become