When an electric current flows through a conductor (like a wire), it produces a magnetic field around it. This is called the magnetic effect of electric current.
Key Concepts:
- Magnetic Field Around a Wire:-
- Current in a wire produces a magnetic field.
- Right-Hand Thumb Rule helps determine the direction of the field.
- Solenoid:-
- A coil of wire that creates a strong magnetic field when current flows through it. It behaves like a magnet.
- Electromagnet:-
- A temporary magnet created by passing current through a coil around an iron core.
- Force on a Current-Carrying Conductor: -
- A wire carrying current in a magnetic field experiences a force.
- Fleming's Left-Hand Rule determines the direction of the force.
Applications:
- Electric Motors:Use the force on current-carrying conductors in a magnetic field to produce motion.
- Electromagnets:Used in devices like cranes to lift heavy magnetic materials.
Practice Questions PDF
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Questions on Magnetic Effects of Electric Current
Showing 151–180 of 215151.A solenoid is essentially a: 152.Which of the following devices relies on the magnetic effect of current to operate? 153.In an electric bell, the hammer strikes the gong when: 154.What happens to the magnetic field strength of an electromagnet if the current passing through its coil is doubled? 155.The magnetic field lines around a straight current-carrying conductor are: 156.When an electric current flows through a wire, the magnetic field produced around it is in the form of: 157.Which property makes soft iron suitable for the core of an electromagnet? 158.What happens to a compass needle if you bring a strong electromagnet close to it with the current on? 159.A current-carrying wire placed in a magnetic field experiences a: 160.Which type of magnet is typically stronger and can be controlled? 161.A key difference between a permanent magnet and an electromagnet is that an electromagnet: 162.If you hold a current-carrying wire in your right hand with your thumb pointing in the direction of the current, your curled fingers indicate the direction of the: 163.The direction of the magnetic field lines around a straight current-carrying conductor can be found using the: 164.Large cranes in junkyards use electromagnets to lift heavy objects because: 165.How does an electric bell work using an electromagnet? 166.Which device uses an electromagnet? 167.An electromagnet loses its magnetism when: 168.Which of the following does NOT affect the strength of an electromagnet? 169.To make an electromagnet stronger, one can: 170.What material is commonly used as the core of an electromagnet? 171.What is an electromagnet? 172.The phenomenon where an electric current produces a magnetic field around it is called the: 173.What did Oersted observe when current flowed through a wire placed near a compass? 174.Who discovered that electric current produces a magnetic field? 175.The region around a magnet where its influence can be detected is called: 176.Which material is attracted by a magnet? 177.What happens to a compass needle when placed near a bar magnet? 178.Imagine that you are sitting in a chamber with your back to one wall. An electron beam, moving horizontally from back wall towards the front wall, is deflected by a strong magnetic field to your right side. What is the direction of magnetic field? 179.When is the force experienced by a current–carrying conductor placed in a magnetic field largest? 180.List two methods of producing magnetic fields.