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A conducting cycle wheel, with each spoke of length $l$, is rotating about its geometrical axis, with uniform angular velocity $\omega$, in a uniform magnetic field as shown in the figure. If the number of spokes are $N$, then calculate the induced emf between the center and the rim of the wheel.

Calculate the resolving power of a microscope with cone angle of light falling on the objective equal to ${60}^{\circ }.$ Take $\lambda =600\text{nm}$ and the refractive index of transparent medium between the object and the objective lens of the microscope, $\mu =4/3.$

Angle of prism is ${30}^{\circ }$ and its refractive index is $\sqrt{2}$ and one of the refracting faces is silvered. At what angle of incidence, a ray should be incident on one surface so that after reflection from the silvered surface, it retraces its path

In the circuit shown in the figure, identify the equivalent gate of the circuit and make its truth table.

If $F_1$ and $F_2$ represents the foci of the lens, then at which point will the light rays meet?

A retarding force of 20 N is applied on a body of mass 2 kg moving at 150 m/s for 10 seconds. Calculate the velocity and the displacement of the body at the end of 10 seconds. What will the displacement of the body 5 seconds after the force is removed.

Ability of the eye to see objects at all distance is called –

What is the function of an earth wire ? Why is it necessary to earth the metallic bodies of electrical appliances ?

The magnitude of the charge of a single electron or a proton is $1.6\times {10}^{-19}C$.
What is the net charge of an object that has 20 electrons and 22 protons?

The Ohm's law states that at constant temperature the current flowing through a conductor is directly proportional to the potential difference across its ends . This means that I proportional to V. Two equate this we need to add a constant. This we get V=R*I . But why can't we write the same equation by adding a constant on the other side as I=R*V . How do we know which side to add the constant and how?

A man weighs $600N$ on the equator, but when he moves to the pole he finds a slight increase in his weight. This is because:

Sir,

I am Shaun job of class 10, I have a doubt in physics on the topic of optics,

This is the question Sir

If the Rayleigh scattering holds good, then the intensity of scattering is inversely proportional to the fourth power of the wavelength, then when sunlight enters the earth's atmosphere, the violet light should get scattered the most and blue light also gets scattered, but less than violet light, so my question is why doesnt the sky appear violet instead of blue??

Thank you Sir

Shaun

1. 0.9

WHAT DOES IT MEAN THAT "ELECTRIC CHARGES ARE QUANTIZED" OR THEY CAN BE STORED IN DISCRETE PACKETS ?WHAT ARE DISCRETE PACKETS?

Consider the circuit given below where A, B and C are three identical light bulbs of constant resistance.

(a) List the bulbs in order of increasing brightness.
(b) IF C burns out, what will be the brightness of A and C compared with before?
(c) If B burns out instead, what will be the brightness of A and C compared with before?

50 kJ of energy causes a displacement of 25 m in a body in the direction of force in 2.5 s. Find the power in horsepower.

An electrical appliance is rated 1500 W, 250 V. This appliance is connected to 250 V mains. The electrical energy consumed in 60 hours is:

Statement:Anyone found smoking in the 'non-smoking' area would be penalized.
Assumptions:
I. There are separate smoking and non-smoking areas.
II. There are some people who do not smoke.

How do these activities affect the growth of plants?

Which of the following is correct regarding the nature of parallel and anti-parallel currents?

What is the principle of method of mixture ? What other name is given to it ? Name the law on which this principle is based .

Question 32

How will you infer with the help of an experiment that the same current flows through every part of the circuit containing three resistances in series connected to a battery?

A cell with unknown emf $E$ is connected in a circuit shown in figure. The value of $E$ for which the potential at $\text{A}$ is equal to the potential at $\text{B}$ will be

Raj mixed water, soil, and oil in a beaker and left it undisturbed for sometime. What will he observe after sometime?

Choose the correct statement:

Statement 1: Unbalanced forces can change the direction of motion.

Statement 2: A balanced force is required to accelerate the motion.

Statement 3: An object moves with a uniform velocity when balanced forces are acting on it and there is no net force acting on it.

Statement 4: Balanced force cannot start a motion.

A glass hemisphere of radius 0.04 m and the refractive index of the material 1.6 is placed centrally over a cross mark on a paper with the flat face in contact with the paper. The cross mark is viewed directly from above. The position of the images will be

Refraction takes place at a concave spherical boundary $($of radius of curvature $R)$ separating glass - air medium. For the image to be real, the object which is placed in glass at a distance $u$ $({\mu }_{glass}=\frac{3}{2})$

The equivalent resistance across $AB$ is -

In the figure given below, a coil is placed between two permanent magnets and it is rotated with the help of an axle on which two rings $R_1$ and $R_2$ are internally attached. $B_1$ and $B_2$ represent metallic brushes, G represents galvanometer. As the coil starts to rotate, the current flows through ABCD as shown. The coil starts to rotate in:​

In this case (image at near point(D)). Find the angular magnification in terms of D and f.