Where does the force come from?

• ashishsinghal
In summary, a circular non-conducting ring with a charge is placed in a uniform magnetic field perpendicular to the ring. The field changes at a rate of dB/dt, causing the ring to rotate in opposition to the change in B according to Lenz's law. However, the question arises as to where the force required to move the ring comes from. By applying basic rules of physics, it is believed that the magnetic field alone cannot affect a stationary charge. However, according to Faraday's law, a changing magnetic field can induce an electric field, proving that both E and B fields are present.
ashishsinghal
We have a circular non conducting ring placed in a uniform magnetic field with its direction perpendicular to the plane of the ring. There is a charge present on the ring. The field changes with a rate dB/dt. By lenz law we know that the ring will start rotating to form a current that will oppose change in B.

But if we apply basic rules of physics - Where does this force required to move the ring come from? there is only magnetic field which cannot affect a rest charge.

ashishsinghal said:
The field changes with a rate dB/dt. ... there is only magnetic field which cannot affect a rest charge.
By Faradays law, if you have a changing B field this will induce an E field. So it is not correct that there is only a B field, there is both E and B.

1. What is the origin of force?

The origin of force is not fully understood and is still a subject of ongoing research. It is a fundamental concept in physics and is described as a push or pull on an object that causes it to accelerate. According to Newton's second law of motion, force is directly proportional to an object's mass and acceleration.

2. Is force a tangible object?

No, force is not a tangible object. It is an abstract concept used to describe the interaction between two objects. Force is measured in units of newtons (N) and is represented by a vector, which has both magnitude and direction.

3. Can force be created or destroyed?

Force cannot be created or destroyed, but it can be transferred from one object to another. This is known as the principle of conservation of energy, which states that energy can neither be created nor destroyed, only transferred or converted into different forms.

4. What are the different types of forces?

There are four fundamental forces in nature: gravity, electromagnetism, strong nuclear force, and weak nuclear force. Gravity is responsible for the attraction between objects with mass, while electromagnetism is responsible for the interaction between charged particles. The strong nuclear force holds together the particles within an atom's nucleus, and the weak nuclear force is involved in the process of radioactive decay.

5. How does force affect motion?

Force is what causes an object to change its state of motion. If the forces acting on an object are balanced, it will remain at rest or continue to move in a straight line at a constant speed. However, if the forces are unbalanced, the object will accelerate in the direction of the net force. This is described by Newton's first law of motion, also known as the law of inertia.

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