Question:
Consider the following statements:
Statement (A): The restoring couple in the moving coil galvanometer is due to the current in the coil.
Statement (B): Wires of magnetic field around a current carrying straight conductor will be circular in a plane parallel to the conductor.
Statement (C): When a charged particle enters a uniform magnetic field, its kinetic energy increases.
Consider the following statements:
Statement (A): The restoring couple in the moving coil galvanometer is due to the current in the coil.
Statement (B): Wires of magnetic field around a current carrying straight conductor will be circular in a plane parallel to the conductor.
Statement (C): When a charged particle enters a uniform magnetic field, its kinetic energy increases.
Statement (A): The restoring couple in the moving coil galvanometer is due to the current in the coil.
Statement (B): Wires of magnetic field around a current carrying straight conductor will be circular in a plane parallel to the conductor.
Statement (C): When a charged particle enters a uniform magnetic field, its kinetic energy increases.
Show Hint
In a moving coil galvanometer, the restoring torque comes from the spring or suspension, not the current. Magnetic field lines around a straight wire are perpendicular circles. Magnetic forces do no work on charged particles in uniform fields; kinetic energy remains constant.
Updated On: Jun 19, 2026
- A, B, C are true
- A, B true, C is false
- A, C true, B is false
- A, B, C are false
Show Solution
Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Step 1: Statement A analysis.
The restoring couple (torque) in a moving coil galvanometer is not due to the current directly. It is caused by a mechanical restoring torque provided by a spring or suspension strip that opposes the rotation. The current produces the deflecting torque.
\(\Rightarrow\) Statement A is false.
Step 2: Statement B analysis.
Magnetic field lines around a straight current-carrying conductor form circular loops around the conductor in planes perpendicular to the conductor, not parallel.
\(\Rightarrow\) Statement B is false.
Step 3: Statement C analysis.
A charged particle moving perpendicular to a uniform magnetic field experiences a magnetic force perpendicular to its velocity. This force does no work on the particle; hence the kinetic energy remains constant. Only the direction of velocity changes.
\(\Rightarrow\) Statement C is false.
Step 4: Conclusion.
All three statements are incorrect.
The restoring couple (torque) in a moving coil galvanometer is not due to the current directly. It is caused by a mechanical restoring torque provided by a spring or suspension strip that opposes the rotation. The current produces the deflecting torque.
\(\Rightarrow\) Statement A is false.
Step 2: Statement B analysis.
Magnetic field lines around a straight current-carrying conductor form circular loops around the conductor in planes perpendicular to the conductor, not parallel.
\(\Rightarrow\) Statement B is false.
Step 3: Statement C analysis.
A charged particle moving perpendicular to a uniform magnetic field experiences a magnetic force perpendicular to its velocity. This force does no work on the particle; hence the kinetic energy remains constant. Only the direction of velocity changes.
\(\Rightarrow\) Statement C is false.
Step 4: Conclusion.
All three statements are incorrect.
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