Physics Test 28...

Electrostatic field is -

Which of the following are electromagnetic waves?

Charges Q,2Q and 4Q are uniformly distributed in three dielectric solid spheres 1,2 and 3 of radii R/2,R and 2R respectively, as shown in figure. If magnitudes of the electric fields at point P at a distance R from the centre of spheres 1,2 and 3 are E₁, E₂ and E₃ respectively, then

A stone exerts a gravitational force on the Earth. Why is the effect of this force not noticeable?

The Magnus effect explains the lift on a spinning ball due to:

The superposition takes place between two waves of frequency f and amplitude a.

Given: Maximum intensity I_max = constant × ____ .

Water enters through end A with speed v₁ and leaves through end B with speed v₂ of a cylindrical tube AB. The tube is always completely filled with water.

Step 1:
In case I, the tube is horizontal and in case II, it is vertical with end A upwards and in case III, it is vertical with end B upwards.

We have v₁ = v₂ for

A time dependent force F = 3t² + 6t acts on a particle of mass 18kg. If particle starts from rest, the work done by the force during the first 3 second, will be:

If λ_v, λ_x and λ_m represent the wavelengths of visible light, X-rays and microwaves respectively, then:

A rectangular plate is measured as follows:
Length L = (12.0 ± 0.2)cm
Width W = (3.0 ± 0.1)cm
Using error propagation for multiplication, report the area A with its uncertainty and correct significant figures.