Physics

The current I in the above given circuit will be:

Given below are two statements:

Statement I : An electric dipole is placed at the centre of a hollow sphere. The flux of electric field through the sphere is zero but the electric field is not zero anywhere in the sphere.

Statement II : If R is the radius of a solid metallic sphere and Q be the total charge on it. The electric field at any point on the spherical surface of radius r (

In the light of the above statements, choose the correct answer from the option given below

B_X and B_Y are the magnetic fields at the centre of two coils X and Y respectively each carrying equal current. If coil X has 200 turns and 20 cm radius and coil Y has 400 turns and 20 cm radius, the ratio of B_X and B_Y is:

Two uniformly charged spherical conductors A and B of radii 5mm and 10mm are separated by a distance of 2cm. If the spheres are connected by a conducting wire, then in equilibrium condition, the ratio of the magnitudes of the electric fields at the surface of the sphere A and B will be:

The recoil speed of a hydrogen atom after it emits a photon in going from n = 5 state to n = 1 state will be

A charge particle is moving in uniform magnetic field $\left(2\widehat{i}+3\widehat{j}\right)$ T. If it has an acceleration of $\left(\alpha \widehat{i}-4\widehat{j}\right)m/s^2$ , then the value of will be:

Given below are two statements:

Statement I : A second's pendulum has a time period of 1 second.

Statement II : It takes precisely one second to move between the two extreme positions.

In the light of the above statements, choose the correct answer from the options given below

In a series LR circuit X_L = R and power factor of the circuit is P₁. When capacitor with capacitance C such that X_L = X_C is put in series, the power factor becomes P₂. The ratio $\frac{P_1}{P_2}$  is:

The magnetic field of a plane electromagnetic wave is given by:

$\overrightarrow{B}=2*10^{-8}$ sin(0.5 * 10³x + 1.5 * 10¹¹t) $\widehat{j}$ T.

The amplitude of the electric field would be:

Given below are two statements : one is labeled as Assertion A and the other is labeled as Reason R.

Assertion A : For a simple microscope, the angular size of the object equals the angular size of the image.

Reason R : Magnification is achieved as the small object can be kept much closer to the eye that 25cm and hence it subtends a large angle.

In the light of the above statements, choose the most appropriate answer from the options given below: