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 121–150 of 215121.What happens to the magnetic field lines near the poles of a magnet? 122.If a current-carrying wire is placed North-South, and current flows from North to South, what will be the direction of the magnetic field directly to the East of the wire? 123.Magnetic field lines point from which pole to which pole outside a magnet? 124.What happens if you try to make an electromagnet without an iron core, just using a coil of wire? 125.Which of these is a temporary magnet? 126.To hold a car door shut, a device sometimes uses an electromagnet. This is because: 127.When a compass needle is placed exactly at the center of a current-carrying circular coil, it will align: 128.An electric current produces a magnetic field. This field can be detected by using a: 129.How can you increase the strength of an electromagnet without adding more turns to the coil? 130.The magnetic field lines inside a current-carrying solenoid are generally: 131.The magnetic poles of an electromagnet are determined by the: 132.Which of the following is a disadvantage of a permanent magnet compared to an electromagnet? 133.When the current in an electromagnet is turned off, what happens to its magnetic field? 134.If an electromagnet is made with a steel core instead of a soft iron core, what would be the likely outcome? 135.What is the role of a commutator in a DC motor? 136.The principle on which an electric motor works is: 137.An electric motor converts: 138.The strength of the magnetic field produced by a current-carrying conductor depends on the: 139.When a current flows through a circular loop of wire, the magnetic field lines inside the loop are: 140.A magnetic compass is used to determine: 141.In the Right-Hand Thumb Rule, if the current flows upwards, the magnetic field lines will be in which direction? 142.Which of the following is essential for the operation of an electromagnet? 143.The magnetic field lines outside a current-carrying solenoid are similar to those of a: 144.What is the effect on the magnetic field inside a solenoid if an iron core is inserted? 145.The North pole of a compass needle points towards the Earth's: 146.The Earth itself acts like a giant: 147.What is the primary function of the switch in an electric bell circuit? 148.Which material would you choose to make a permanent magnet? 149.The poles of an electromagnet can be reversed by: 150.When current flows through a solenoid, it behaves like a: