What is that instrument which can detect the presence of electric current in a circuit?a)galvanometerb)motorc)generatord)none of aboveCorrect answer is option 'A'. Can you explain this answer?

Question

Answer

Ammeter also detects and measures current. But galvonometer only detects the current.

Answer

Absolutely 'A' sahi hai

Answer

Galvanometer, instrument for measuring a small electrical current or a function of the current by deflection of a moving coil. The deflection is a mechanical rotation derived from forces resulting from the current.

Answer

Correct answer is galvanometer it can able to detect a small amount of current in the circuit

so correct option is A

Answer

Galvanometer

Answer

Introduction:
The instrument that is used to detect the presence of electric current in a circuit is called a galvanometer. It is a device that measures the flow of electric current in a circuit. It is commonly used in various applications, including electronics, electrical engineering, and physics experiments. In this answer, we will discuss the working principle and construction of a galvanometer and why it is the correct answer to the given question.

Working Principle of a Galvanometer:
A galvanometer works on the principle of electromagnetic induction. It consists of a coil of wire suspended between the poles of a permanent magnet. When an electric current flows through the coil, it experiences a magnetic force due to the interaction between the magnetic field of the permanent magnet and the magnetic field produced by the current in the coil. This magnetic force causes the coil to rotate, and the amount of rotation is proportional to the current flowing through the coil.

Construction of a Galvanometer:
A galvanometer consists of the following components:
1. Coil: The coil is made up of a thin wire wound into a circular shape. It is usually mounted on a spindle that allows it to rotate freely.
2. Permanent Magnet: The permanent magnet provides a constant magnetic field in the region where the coil is suspended. The magnetic field is typically uniform and perpendicular to the plane of the coil.
3. Control Spring: The control spring is attached to the coil and provides a restoring torque that opposes the rotation of the coil. It ensures that the coil returns to its zero position when there is no current flowing through it.
4. Pointer: The coil is attached to a pointer, which indicates the amount of rotation of the coil. The pointer is usually calibrated to provide a reading of the current flowing through the coil.

Why is a Galvanometer the Correct Answer?
Out of the given options, a galvanometer is the correct answer because it is specifically designed to detect the presence of electric current in a circuit. When a current flows through the coil of a galvanometer, it causes the coil to rotate, indicating the presence of current. The amount of rotation is directly proportional to the current flowing through the coil, allowing the galvanometer to measure the magnitude of the current. A motor and generator, on the other hand, are devices that convert electrical energy into mechanical energy or vice versa and are not primarily used for detecting the presence of electric current in a circuit. Therefore, the correct answer is option A - galvanometer.

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