A device uses the principle of magnetic fields around a current-carrying conductor to convert electrical energy to mechanical energy. Which device operates on this principle?
Electric motor
A current-carrying conductor placed in a magnetic field experiences a force whose direction is given by Fleming's left-hand rule.
An electric motor uses this force on the coil sides to produce a couple, which rotates the armature; electrical energy fed to the coil is thus converted into mechanical rotation.
A transformer only steps voltage up or down between two coils (no moving parts), a solar cell converts light directly into electricity, and a galvanometer just detects small currents by a small deflection of its needle.
Hence, the device is an electric motor.
Similar Questions
A single-turn coil of radius R produces a magnetic field B at its centre. If the same wire is wound into a coil of n turns (each of radius R/n) carrying the same current I, what will be the value of the new field at the centre?
A student places a compass near a straight, current-carrying conductor and observes the needle deflect. What does this observation indicate about the region around the conductor?
In Fleming's Left Hand Rule, which finger represents the direction of the magnetic field?
What does a higher degree of closeness of magnetic field lines indicate?
What happens when a conductor moves through a magnetic field?
A student wants to use the Right Hand Thumb Rule to determine the direction of the magnetic field around a current-carrying straight conductor. Which of the following steps is essential in applying the rule correctly?
Why are magnetic field lines due to current in a straight conductor denser near the wire and farther apart as distance increases?
A technician reverses the direction of current in a conductor placed in a magnetic field. According to Fleming's Left Hand Rule, what will happen to the direction of force on the conductor?
An electron enters a uniform magnetic field at right angles to it. If the magnetic field is directed into the page and the electron enters toward the right, what is the direction of the force acting on the electron?
In an experiment, a metal rod moves northward across a horizontal magnetic field directed east. According to Fleming's Right Hand Rule, what is the direction of the induced current in the rod?
Important Questions from Magnetism
- The magnetic field around a straight current-carrying conductor:
Magnetic field is a quantity that has___________________ .
- The right-hand thumb rule is used to find which of the following?
- How are the magnetic field lines arranged inside a current-carrying solenoid?
- What does it mean when magnetic field lines are drawn closer together in a diagram?
