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A frog can be levitated in a magnetic fi...

A frog can be levitated in a magnetic field produced by a current in a vertical solenoid placed below the frog. This is possible because the body of the frog behaves as

A

paramagnetic

B

diamagnetic

C

ferromagnetic

D

anti - ferromagnetic

Text Solution

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The correct Answer is:
To solve the question, we need to understand the behavior of the frog in the magnetic field produced by the solenoid. Let's break down the solution step by step: ### Step 1: Understanding the Scenario A frog is placed above a vertical solenoid that generates a magnetic field when current flows through it. The question asks us to determine how the frog can be levitated in this magnetic field. **Hint:** Consider the forces acting on the frog and the nature of the magnetic field produced by the solenoid. ### Step 2: Analyzing Forces For the frog to be levitated, the net force acting on it must be zero. The downward force acting on the frog is its weight (W). To achieve levitation, there must be an upward magnetic force (F_m) that counteracts the weight. **Hint:** Think about how the magnetic force can act on the frog and what conditions are necessary for levitation. ### Step 3: Magnetic Behavior of the Frog The key to this phenomenon lies in the magnetic properties of the frog's body. The frog behaves as a diamagnetic substance. Diamagnetic materials are characterized by the fact that they are repelled by magnetic fields. **Hint:** Recall the properties of diamagnetic materials and how they interact with magnetic fields. ### Step 4: Interaction with the Magnetic Field When the frog is placed above the solenoid, the magnetic field produced by the solenoid induces a magnetic response in the frog's body. The atoms in the frog's body behave like tiny magnets that align in opposition to the external magnetic field, resulting in a repulsive force. **Hint:** Consider how the alignment of atomic magnetic moments in the frog contributes to the overall magnetic behavior. ### Step 5: Conclusion Since the frog is repelled by the magnetic field generated by the solenoid, the upward magnetic force can balance the downward gravitational force (weight), allowing the frog to levitate. Thus, we conclude that the body of the frog behaves as a diamagnetic substance. **Final Answer:** The body of the frog behaves as a diamagnetic substance.
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