NEET 2026
- Exam
- NEET
- Year
- 2026
- Subject
- Physics
- Chapter
- Chapter
NEET 2026 · Physics · Chapter
A small block is placed on a frictionless horizontal track that...
A small block is placed on a frictionless horizontal track that passes near the poles of a powerful electromagnet, where the magnetic field is non-uniform.
A. The block will experience a net force towards the stronger field region if it is made of a paramagnetic material.
B. The block will experience a net force towards the stronger field region if it is made of a diamagnetic material.
C. The block will experience a retarding force when pushed into the magnetic field if it is made of a conducting metal.
D. The block will experience a retarding force when pushed into the magnetic field if it is made of an insulating plastic.
Choose the correct statement(s) from the options given below:
A. The block will experience a net force towards the stronger field region if it is made of a paramagnetic material.
B. The block will experience a net force towards the stronger field region if it is made of a diamagnetic material.
C. The block will experience a retarding force when pushed into the magnetic field if it is made of a conducting metal.
D. The block will experience a retarding force when pushed into the magnetic field if it is made of an insulating plastic.
Choose the correct statement(s) from the options given below:
Options
- AA, B and C only
- BB and D only
- CA and C only
- DC and D only
Correct answer
C. A and C only
Step-by-step solution
Paramagnetic materials are weakly attracted by a magnetic field and tend to move from a region of weaker magnetic field to a region of stronger magnetic field. Hence, statement A is correct.
Diamagnetic materials are weakly repelled by a magnetic field and tend to move from a region of stronger magnetic field to a region of weaker magnetic field. Hence, statement B is incorrect.
When a conducting metal block is pushed into a magnetic field, eddy currents are induced in it. According to Lenz's law, the direction of induced eddy currents is such that it opposes the relative motion of the block. Thus, it experiences a retarding force. Hence, statement C is correct.
An insulating plastic does not have free electrons, so no eddy currents are induced. It will not experience any retarding force. Hence, statement D is incorrect.
Therefore, only statements A and C are correct.
Answer: A and C only
Diamagnetic materials are weakly repelled by a magnetic field and tend to move from a region of stronger magnetic field to a region of weaker magnetic field. Hence, statement B is incorrect.
When a conducting metal block is pushed into a magnetic field, eddy currents are induced in it. According to Lenz's law, the direction of induced eddy currents is such that it opposes the relative motion of the block. Thus, it experiences a retarding force. Hence, statement C is correct.
An insulating plastic does not have free electrons, so no eddy currents are induced. It will not experience any retarding force. Hence, statement D is incorrect.
Therefore, only statements A and C are correct.
Answer: A and C only