List of top Questions asked in AP EAPCET- 2025

A long straight wire of circular cross-section of radius \( a \) is carrying a steady current. The current is distributed uniformly across the cross-section of the wire. The ratio of the magnetic fields at points \( 0.5a \) and \( 1.5a \) from the centre of the wire is:
The magnetic field at the centre of a current carrying circular coil of radius R is \( B_C \) and the magnetic field at a point on its axis at a distance R from its centre is \( B_A \). The value of \( \frac{B_C}{B_A} \) is
If the given figure shows the relation between magnetic field (B along y-axis) and magnetic intensity (H along x-axis) of a ferromagnetic material, then the point that represents coercivity of the material is:
relation between magnetic field (B along y-axis) and magnetic intensity
The electric field between the plates of a parallel plate capacitor changes at the rate of \(4.5 \times 10^{7} \, {V/m/s}\). If the plates of the capacitor are circular with radius 2 cm, then the displacement current inside the capacitor is:
If the magnetisation of a material is M and the magnetic field in the material is B, then the magnetic intensity is: ($\mu_0$ = permeability of free space)
A velocity selector is to be constructed to select ions with a velocity of 6 km/s. If the electric field used is 400 V/m, then the magnetic field to be used is
A sample of paramagnetic salt contains $2 \times 10^{24}$ atomic dipoles each of dipole moment $1.5 \times 10^{-23} \, \text{JT}^{-1}$. The sample is placed under homogeneous magnetic field of 0.6 T and cooled to a temperature 4.2 K. The degree of magnetic saturation achieved is 20%. Then total dipole moment of the sample for a magnetic field of 0.9 T and a temperature of 2.8 K is
The magnetic field at the centre of a current carrying circular coil of radius R is \( B_C \) and the magnetic field at a point on its axis at a distance R from its centre is \( B_A \). The value of \( \frac{B_C}{B_A} \) is
In a wire of radius 1 mm, a steady current of 2 A uniformly distributed across the cross-section of the wire is flowing. Then the magnetic field at a point 0.25 mm from the centre of the wire is
A short bar magnet of magnetic moment \( 10^4 \, \text{J T}^{-1} \) is free to rotate in a horizontal plane. The work done in rotating the magnet slowly from the direction parallel to a horizontal magnetic field of \( 4 \times 10^{-5} \, \text{T} \) to a direction \( 60^\circ \) to the direction of the field is
A galvanometer having 30 divisions has a current sensitivity of \(0.0625 \, \frac{\text{div}}{\mu\text{A}}\). If it is converted into a voltmeter to read a maximum of 6 V, then the resistance of that voltmeter is:
A coil having 100 square loops each of side 10 cm is placed such that its plane is normal to a magnetic field, which is changing at a rate of \( 0.7 \ \text{T s}^{-1} \). The emf induced in the coil is
If an electric generator produces a potential difference of \(180\,{kV}\) in a spark of length \(9\,{cm}\), then the maximum electric field generated is:
To decrease the capacitance of a parallel plate capacitor:

If five parallel plate capacitors are connected to the battery of 240 V as shown in the figure, the charge on 1$\mu$F capacitor is:

The energy stored in a capacitor is $W$. To double the charge on the plates of the capacitor, the additional work to be done is
An electric dipole with dipole moment $2 \times 10^{-10}\, C \cdot m$ is aligned at an angle $30^\circ$ with the direction of a uniform electric field of $10^4\, N/C$. The magnitude of the torque acting on the dipole is
The force between two point charges kept with a separation of 9 cm in air is 98 N. If a dielectric slab of constant 4, thickness 6 cm and another dielectric slab of constant 9, thickness 3 cm are introduced between the two charges, then the new force becomes
Three point charges shown in the figure lie along a straight line. The energy required to exchange the position of central charge with one of the negative charges is
Three point charges shown in the figure lie along a straight line.
If the energy stored in a spherical conductor having a charge of \( 12 \, \mu C \) is \( 6 \, \text{J} \), then the radius of the spherical conductor is:
Two charged conducting spheres of radii 5 cm and 10 cm have equal surface charge densities. If the electric field on the surface of the smaller sphere is E, then the electric field on the surface of the larger sphere is
Two point charges +4µC and -9µC are placed 2m apart in air. Find the point on the line joining them where the electric potential is zero.
An electric charge $10^{-3}\, \mu C$ is placed at the origin of the x-y plane. The potential difference between points A and B located at $(\sqrt{2}\, m, \sqrt{2}\, m)$ and $(2m, 0m)$ respectively is
If 27 identical charged conducting spheres, each of capacitance \( 10 \mu F \), combine to form a big sphere, then the capacitance of the big sphere is:
Four capacitors are connected as shown in the figure. If \( C_1, C_2, C_3 \) and \( C_4 \) are in the ratio \( 1:2:3:4 \), then the ratio of the charges on the capacitors \( C_2 \) and \( C_4 \) is