Magnetic Effects Of Electric Current is a fundamental concept in physics. Test your understanding of this subject with the following multiple-choice questions. Each question is complemented by the correct answer and a concise explanation.
1. The magnetic effect of an electric current was first observed by:
Answer:
Explanation:
Oersted was the first to discover that an electric current produces a magnetic field.
2. A magnetic field around a current-carrying conductor will:
Answer:
Explanation:
The direction of the magnetic field depends on the direction of the current, according to the right-hand thumb rule.
3. The strength of the magnetic field around a conductor is increased by:
Answer:
Explanation:
The strength of the magnetic field is directly proportional to the current flowing through the conductor.
4. Which of the following is NOT a property of magnetic lines of force?
Answer:
Explanation:
Magnetic lines of force can be curved.
5. The phenomenon of inducing a voltage in a conductor by changing the magnetic field around it is called:
Answer:
Explanation:
The process in which a voltage is induced in a conductor due to a change in magnetic field around it is termed magnetic induction.
6. An electromagnet differs from a permanent magnet because:
Answer:
Explanation:
An electromagnet’s magnetic field can be turned on or off by controlling the electric current.
7. A solenoid acts more like:
Answer:
Explanation:
When current flows through a solenoid, it produces a magnetic field similar to that of a bar magnet.
8. Fleming’s right-hand rule is used for finding:
Answer:
Explanation:
Fleming’s right-hand rule gives the direction of induced current when a conductor moves in a magnetic field.
9. The device that converts electrical energy into mechanical energy using the magnetic effects of current is:
Answer:
Explanation:
A motor uses the magnetic effects of current to produce motion or mechanical energy.
10. A galvanometer can be converted into an ammeter by connecting a:
Answer:
Explanation:
By connecting a low resistance (shunt) in parallel to a galvanometer, it can measure larger currents, effectively converting it into an ammeter.
11. The principle of an electric generator is based on:
Answer:
Explanation:
Generators work on the principle of electromagnetic induction to produce electric current.
12. The fingers of the right hand curled in the direction of current give the direction of:
Answer:
Explanation:
This is the right-hand thumb rule or Maxwell’s corkscrew rule.
13. A moving coil galvanometer works on the principle of:
Answer:
Explanation:
In a moving coil galvanometer, the coil is deflected in a magnetic field due to the current flowing through it.
14. The magnetic field inside a long straight solenoid carrying current:
Answer:
Explanation:
Inside a solenoid, the magnetic field is nearly uniform.
15. The device used to measure the strength of the magnetic field is called:
Answer:
Explanation:
A magnetometer is specifically designed to measure the strength and direction of magnetic fields.
This set of MCQs provides a concise overview of the magnetic effects of electric current. Review these to test and reinforce your understanding. Best of luck with your studies!