Understanding Physics Electromagnetism
The physics electromagnetic force is one of the four fundamental forces of nature, responsible for interaction between electrically charged particles. It is essential in many applications like electric motors, transformers, and communication systems. This idea is based on the interconnection of electricity and magnetism, whereby an electric current creates a magnetic field, and a varying magnetic field generates an electromotive force.
Electromagnetic Force and Its Importance
The electromagnetic force binds electrons to atomic nuclei and is essential for an understanding of electrical circuits, magnetism, and wave propagation. This is a force that obeys Coulomb’s Law which accounts for the attraction and repulsion of charged particles. This interaction is important to know in respect to engineering, physics and technology.
Electromagnetic Induction and Faraday’s Law
This phenomenon is called electromagnetic induction, which occurs when a changing magnetic field generates a current in a conductor. The electromotive force (or EMF) induced is proportional to the rate of change of the magnetic flux according to Faraday’s Law of Induction. This principle is what many generators, transformers, and wireless charging technology is based on, making it one of the most important principles in the field of generating and distribution.
Electromagnetic Waves and Their Applications
Physics Electromagnetic waves are waves that consist of oscillating electric and magnetic fields, traveling through space at the speed of light. They are classified into different types, such as radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. These waves have extensive applications in communication, medical imaging, and industrial processes.
Physics Electromagnetism MCQs
1. A current is passed through a straight wire. The magnetic filed established around it has its of force ?
- Circular and endlesscorrect
- All are true
- Parabolic
- Oval in shape and endless
- Straight
2. The permeability of free space is measured in ?
- Wb/Amcorrect
- None of these
- m/Web A
- Am/Wb
- Wb A/m
3. The magnetic filed inside a solenoid can be increased by ?
- Increasing I
- All correct except Bcorrect
- By using iron core within the solenoid
- Decreasing I
- Increasing n
4. In the region surrounding a current carrying wire ?
- Direction of lines of force depends upon direction of current
- The lines of force are elliptical
- A magnetic field is set up
- Both A & Ccorrect
5. If the field is directed along the normal to the area, then flux is ?
- Both A & Ccorrect
- Minimum
- Equal to BA
- Equal to Zero
- Maximum
6. The direction of magnetic lines of force around a current carrying wire is given by ?
- Right hand rulecorrect
- Faraday’s law
- Head to tail rule
- None of these
- Both A and B
7. The filed is uniform and much stronger ?
- Inside a long solenoidcorrect
- Outside a long solenoid
- None of these
- At the end of a long solenoid
- At the central point of a long solenoid
8. Magnetic lines of force ?
- Cannot intersect at allcorrect
- Intersect at neutral points
- Intersect at infinity
- Intersect within magnet
9. When some compass needles are placed on a card board along a circle with the centre at the wire, they will ?
- Point in the direction of N.Scorrect
- Set themselves tangential to the circle
- Point in the direction of E-W
- Point in the direction of S-E
10. Magnetic induction is also called ?
- Both A & B
- Both A & Ccorrect
- Magnetic flux
- Magnetic flux density
- Magnetic field strength
11. Magnetic flux density at any point due to current carrying conductor can be computed by ?
- Lenz’s law
- Faraday’s law
- Coulomb’s law
- Ampere’s lawcorrect
- Newton’s law
12. Magnetic filed is a ?
- Scalar quantity
- Scalar as well as vector quantity
- Vector quantitycorrect
- Neither A nor B
13. If a copper rod carries a direct current, the magnetic field associated with the current will be ?
- Only inside the rod
- Both inside and outside the rodcorrect
- Neither inside nor outside the rod
- Only outside the rod
14. The pointer of a magnetic compass ?
- Aligns itself perpendicular to the magnetic filed
- Vibrates in the magnetic filed of the current
- Is affected only by permanent magnets
- Aligns itself parallel to the applied magnetic filedcorrect
15. If current carrying conductor is placed perpendicular to the magnetic fields, it will experience a force ?
- Zero
- Both A & B
- ILBcorrect
- ILB cos a
16. Amperean path is a ?
- Rectangular path
- Closed path
- Circular path
- Any of abovecorrect
- Broken path
17. The unit of Iι I in case of solenoid is ?
- Any of A or B
- Both B and C
- Number of turns
- Amperecorrect
- Metre
18. The strength of magnetic filed around a straight conductor ?
- Obeys inverse square law
- All are true
- Is same every where around the conductor
- None of thesecorrect
- Is directly proportional to the square of distance from the conductor
19. Hold the solenoid in the right hand with finger curling in the direction of current. The direction of the filed will be given by ?
- Thumbcorrect
- Curled fingers
- Middle finger
- Arm of right hand
20. Tesla is unit of ?
- Magnetic flux
- Flux densitycorrect
- Either A & B
- Electric flux
21. If the number of turns of a solenoid (carrying a steady current I) is doubled without changing the length of solenoid, then magnetic field ?
- Is not affected
- Becomes doublecorrect
- Becomes one fourth
- None of these
- Becomes half
22. It is customary to represent a current flowing towards the reader by a symbol ?
- (+)
- (*)
- (-)
- (.)correct
23. Total number of turns on 0.15 m length of solenoid is 300. The value of n is ?
- Equal to 300
- Greater than 300correct
- Smaller than 300
- Any of A or B
- Any of A or C
24. A current carrying conductor set up its own ?
- Magnetic filed
- Both A & Ccorrect
- Electric filed
- Nuclear filed
25. A solenoid is a coil of wire which is ?
- Long, tightly wound, cylindricalcorrect
- Long, loosely wound, cylindrical
- None of these
- Long, tightly wound, spherical
- Short, loosely wound, cylindrical
This set of Physics Electromagnetism MCQs ensures students gain a deep understanding of key concepts required for the ECAT Entry Test. Nokryan.com provides comprehensive preparation resources, helping candidates achieve high scores in their exams. Mastering electromagnetism is essential for excelling in physics and succeeding in engineering and technology-related fields.