List of top Physics Questions on Electric charges and fields asked in NEET (UG)

An electric dipole is placed at an angle of 30° with an electric field of intensity 2x105 NC-1. It experiences a torque equal to 4 Nm. Calculate the magnitude of charge on the dipole, if the dipole length is 2cm.

If \(∮_s\overrightarrow{E}.\overrightarrow{dS}=0\) over a surface, then:
As the temperature increases, the electrical resistance:
Two charged spherical conductors of radius R1 and R2 are connected by a wire. Then the ratio of surface charge densities of the spheres (σ1 /σ2 ) is
A spherical conductor of radius 10 cm has a charge of \(3.2 \times 10^{-7} C\) distributed uniformly. What is the magnitude of electric field at a point \(15\,cm\) from the centre of the sphere?
\((\frac {1}{4\pi \epsilon_o} = 9 \times 10^9 Nm^2/C^2)\)
A square surface of side L m is in the plane of the paper. A uniform electric field \(\rightarrow\) E \(\bigg(\frac{V}{m}\bigg)\), also in the plane of the paper, is limited only to the lower half of the square surface, (see figure). The electric flux in SI units associated with the surface is :
A uniform rod of length l and mass m is free to rotate in a vertical plane about A. The rod initially in horizontal position is released. The initial angular acceleration of the rod is : (Moment of inertia of rod about A is \(\bigg(\frac{ml^2}{3}\bigg)\)
When three identical bulbs of 60 watt 200 volt rating are connected in series to a 200-volt supply, the power drawn by them will be

A charge Q µc is placed at the centre of cube, the flux coming out from any surfaces will be : -

An electron is moving around the nucleus of a hydrogen atom in a circular orbit of radius r. The coulomb force \(\vec F\) between the two is- (where K=\(\frac{1}{4\pi\epsilon_0}\))