List of top Physics Questions asked in VITEEE

A neutral water molecule $(H_2O)$ in its vapour state has an electric dipole moment of magnitude $6.4 \times 10^{-30} C-m$ . How far apart are the molecules centres of positive and negative charges?

A small coil is introduced between the poles of an electromagnet so that its axis coincides with the magnetic field direction. The number of turns is n and the cross-sectional area of the coil is $A$. When the coil turns through $180^{\circ}$ about its diameter, the charge flowing through the coil is $Q$. The total resistance of the circuit is $R$. What is the magnitude of the magnetic induction?

Two light sources are said to be coherent if they are obtained from

Magnetic field at the centre of a circular loop of area $A$ is $B$. The magnetic moment of the loop will be

Figure shows a straight wire length $l$ carrying current $i$. The magnitude of magnetic field produced by the current at point $P$ is.

Zener diode is used for

The attenuation in optical fibre is mainly due to

A bullet of mass \(0.02\,kg\) travelling horizontally with velocity \(250\,m\,s^{-1}\) strikes a block of wood of mass \(0.23\,kg\) which rests on a rough horizontal surface. After the impact, the block and bullet move together and come to rest after travelling a distance of \(40\,m\). The coefficient of kinetic friction on the rough surface is \((g = 9.8\,m\,s^{-2})\)

Two persons \(A\) and \(B\) are located in X-Y plane at points \((0,0)\) and \((0,10)\) respectively. (The distances are measured in MKS unit). At a time \(t = 0\), they start moving simultaneously with velocities \(\vec{v_A} = 2\hat{i}\,m\,s^{-1}\) and \(\vec{v_B} = 2\hat{i}\,m\,s^{-1}\) respectively. Determine time after which \(A\) and \(B\) are at their closest distance.

Current flow in each of the following circuit A and B respectively are

A wheel of radius \(0.4\,m\) can rotate freely about its axis as shown in the figure. A string is wrapped over its rim and an mass of \(4\,kg\) is hung. An angular acceleration of \(8\,rad\,s^{-2}\) is produced in it due to the torque. (Take \(g = 10\,m\,s^{-2}\)) The moment of inertia of the wheel is

A rod of length \(l\) is held vertically stationary with its lower end located at a point \(P\) on the horizontal plane. When the rod is released to topple about \(P\), the velocity of the upper end of the rod with which it hits the ground is

A wire of length \(l\) is bent into a circular loop of radius \(R\) and carries a current \(I\). The magnetic field at the centre of the loop is \(B\). The same wire is now bent into a double loop of equal radii. If both loops carry the same current \(I\) and it is in the same direction, the magnetic field at the centre of the double loop will be

An infinitely long straight conductor is bent into the shape as shown below. It carries a current of \(1\) ampere and the radius of the circular loop is \(R\) metre. Then, the magnitude of magnetic induction at the centre of the circular loop is

A photon of energy \(E\) ejects a photoelectron from a metal surface whose work function is \(W_0\). If this electron enters into a uniform magnetic field of induction \(B\) in a direction perpendicular to the field and describes a circular path of radius \(r\), then the radius \(r\) is given by (in the usual notation)

The work function of a certain metal is \(3.31 \times 10^{-19}\,J\). Then, the maximum kinetic energy of photoelectrons emitted by incident radiation of wavelength \(5000\,\AA\) is (given \(h = 6.62 \times 10^{-34}\,Js\), \(c = 3 \times 10^8\,m\,s^{-1}\), \(e = 1.6 \times 10^{-19}\,C\))

Two radioactive materials \(x_1\) and \(x_2\) have decay constants \(10\lambda\) and \(\lambda\) respectively. Initially they have the same number of nuclei, then the ratio of the number of nuclei of \(x_1\) to that of \(x_2\) after a time \(t\) will be \(1/e\). The value of \(t\) is

A cell in secondary circuit gives null deflection for \(2.5\,m\) length of wire for a potentialmeter having \(10\,m\) length of wire. If the length of the potentiometer wire is increased by \(1\,m\) without changing the cell in the primary, the position of the null point now is

The following series L-C-R circuit, when driven by an emf source of angular frequency \(70\) kilo-radians per second, the circuit effectively behaves like

Two bar magnets \(A\) and \(B\) are placed one over the other and are allowed to vibrate in a vibration magnetometer. They make \(20\) oscillations per minute when the similar poles of \(A\) and \(B\) are on the same side, while they make \(15\) oscillations per minute when their opposite poles lie on the same side. If \(M_A\) and \(M_B\) are the magnetic moments of \(A\) and \(B\), and \(M_A>M_B\), the ratio \(M_A : M_B\) is

A bar magnet is \(10\,cm\) long and is kept with its north pole pointing north. A neutral point is formed at a distance of \(15\,cm\) from each pole. Given the horizontal component of earth's field is \(0.4\) Gauss, the pole strength of the magnet is

In the adjacent shown circuit, a voltmeter of internal resistance \(R_v\), when connected across \(B\) and \(C\) reads \(\dfrac{100}{3}\,V\). Neglecting the internal resistance of the battery, the value of \(R_v\) is

An infinitely long straight wire has uniform linear charge density of \(\dfrac{1}{3}\,cm^{-1}\). Then, the magnitude of the electric intensity at a point \(18\,cm\) away is (given \(\varepsilon_0 = 8.8 \times 10^{-12}\,C^2N^{-1}m^{-2}\))

Two point charges \(-q\) and \(+q\) are located at points \((0,0,-a)\) and \((0,0,a)\), respectively. The electric potential at a point \((0,0,z)\), where \(z>a\) is

The two lenses of an achromatic doublet should have