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A light body is hanging at the lower end...

A light body is hanging at the lower end of a vertical spring . On passing current in the spring, the body

A

(a)rises up

B

(b)goes down

C

(c)no change

D

(d)oscillates up & down

Text Solution

AI Generated Solution

The correct Answer is:
To solve the problem step by step, we can analyze the situation involving the light body hanging from a vertical spring when current is passed through the spring. ### Step-by-Step Solution: 1. **Understanding the Setup**: - We have a vertical spring with a light body (let's denote its weight as W) hanging from its lower end. - The spring is fixed at its upper end, and the body is suspended at the lower end. **Hint**: Visualize the setup by drawing a vertical spring with a mass hanging from it. 2. **Current Flow**: - When current is passed through the spring, we can consider the spring as a coil that carries current. - The direction of the current flow is important to determine the magnetic effects. **Hint**: Remember that current creates a magnetic field around the conductor. 3. **Magnetic Interaction**: - According to the right-hand rule, when current flows through a conductor, it generates a magnetic field. - In this case, the magnetic field produced by the current in the spring will interact with the magnetic field of the earth (or any nearby magnetic field). **Hint**: Think about how magnetic fields interact with each other. 4. **Force on the Body**: - The magnetic field generated by the current will exert a force on the light body hanging from the spring. - This force will act in such a way that it attracts the body upwards. **Hint**: Consider the direction of the force due to the magnetic field and how it affects the weight of the body. 5. **Effect on Spring Extension**: - As the magnetic force acts on the body, it will counteract the weight of the body. - This results in a decrease in the extension of the spring, as the body is lifted upwards. **Hint**: Relate the decrease in extension to the balance of forces acting on the body. 6. **Conclusion**: - Since the magnetic force is acting upwards, the body will rise as the extension of the spring decreases. - Therefore, we conclude that the body will move upward when the current is passed through the spring. **Hint**: Summarize the effects of the magnetic force and the spring's response to the current. ### Final Answer: The body will rise up when current is passed through the spring.
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