MCQ
Who discovered the magnetic effect of electric current?
- AOersted
- BNewton
- CEinstein
- DMaxwell
✓
Answer
- Oersted
Explanation:
Oersted's law is the law that a steady electric current creates a magnetic field around it. This was discovered on April 21, 1820, by Danish physicist Hans Christian Oersted(1777–1851), when he noticed that the needle of a compass next to a wire carrying current turned.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Ionization energy of a hydrogen-like ion A is greater than that of another hydrogen-like ion B. Let r, u, E and L represent the radius of the orbit, speed of the electron, energy of the atom and orbital angular momentum of the electron respectively. In ground state:
- rA > rB
- uA > uB
- EA > EB
- LA > LB
How many electrons will there be in one coulomb of charge?
If the turns ratio of a transformer is 2 and the impedance of primary coil is 250 W then the impedance of secondary coil will be.
Which of the following is not a correct statement with respect to the given circuit?
The energy of a photon of light of wavelength 450 nm is
|
(a) 4.4 |
(b) 2.5 |
(c) 1.25 |
(d) 2.5 |
The maximum kinetic energy of a photo electron emitted from a metal is 1.8 eV . The value of stopping potential (cut-off voltage) will be :
The concepts of holes is introduced based on:
Number of electrons present in 8 coulomb negative charge is :
An electric heater is heated by de and ac respec- tively. The potential difference applied across the ends of heater for both ac and de is same. Heat gener- ated per second will be more:
Which of the following statements is wrong ? Magnetic lines of force: