Galvanometer Function and Principles

This video tutorial explains the working of a permanent magnet moving coil galvanometer. It begins with an introduction to the galvanometer, describing it as an electromechanical instrument for detecting electric current. The construction details are covered, highlighting the components like the permanent magnets, coil, and springs. The principle of operation is explained, focusing on how the current-carrying coil experiences torque in a magnetic field. The importance of a radial magnetic field is discussed, emphasizing its role in providing constant torque and facilitating calibration. The video concludes with a call to action for viewers to subscribe.

What is the primary function of a galvanometer?

• To generate electricity

• To detect and indicate electric current

• To store electrical energy

• To convert AC to DC

What material is typically used for the coil in a Permanent Magnet Moving Coil Galvanometer?

• Plastic

• Copper

• Steel

• Aluminum

What role do the phosphor bronze springs play in the galvanometer?

• They measure the current

• They generate electricity

• They provide support to the magnets

• They create counter torque to prevent unnecessary deflection

What is the purpose of the soft iron core in the galvanometer?

• To increase the resistance of the coil

• To provide electrical insulation

• To improve the strength and make the magnetic field radial

• To reduce the weight of the device

According to the working principle, what happens when current flows through the coil in a magnetic field?

• The coil experiences a torque

• The coil generates heat

• The coil loses its magnetic properties

• The coil remains stationary

In the context of the galvanometer, what does Fleming's left-hand rule help to determine?

• The direction of the magnetic field

• The direction of the current

• The direction of the force on the coil

• The amount of current flowing

What is the significance of the calibrated scale in a galvanometer?

• It adjusts the magnetic field strength

• It converts angular deflection to microamperes

• It measures the temperature

• It provides a visual display of voltage

Why is a radial magnetic field important in a galvanometer?

• It increases the size of the device

• It ensures constant torque for accurate measurement

• It allows the use of fewer components

• It reduces the cost of production

What is the effect of having a constant angle between the magnetic field and the area vector in the galvanometer?

• It makes the torque variable

• It causes the coil to overheat

• It ensures the torque is constant

• It reduces the sensitivity of the device

What is the relationship between the deflection of the pointer and the current in a galvanometer with a radial magnetic field?

• Deflection is inversely proportional to the current

• Deflection is proportional to the square of the current

• Deflection is directly proportional to the current

• Deflection is unrelated to the current