MCQ
Mark the incorrect statement.
- Aelectric current produces magnetism.
- Bmagnets can produce electric current.
- Cmagnets can't produce electric current.
- Da and b
✓
Answer
- magnets can't produce electric current.
Explanation:
A magnet can generate electric current by the means of electromagnetic induction. When there is a relative motion between a coil and a magnet, the magnetic flux linked to the coil changes due to that relative motion. This change in magnetic flux will induce a current in the coil, which is known as induced current.
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
A current source sends a current $\text{I}-\text{i}_0\cos(\omega\text{t}).$ when connected across an unknown load, it gives a voltage output of $\text{v}=\text{v}_0\sin[\omega\text{t}+(\frac{\pi}{4})]$across that load. then the voltage across the current source may be brought in phase with the current through it by.
→Due to 10 ampere of current flowing in a circular coil of 10 cm radius, the magnetic field produced at its centre is 3.34 
. The number of turns in the coil will be
|
(a) 5000 |
(b) 100 |
(c) 50 |
(d) 25 |
What parameter is used to measure the stability of a nucleus?
The image distance of an object placed 10 cm in front of a thin lens of focal length + 5 cm is
|
(a) 6.5 cm |
(b) 8.0 cm |
(c) 9.5 cm |
(d) 10.0 cm |
An electron is traveling along the x - direction. It encounters a magnetic field in the y - direction. Its subsequent motion will be:
de-Broglie wavelength ($ \lambda $) of different particles having same kinetic energy depends on their mass as :
→Eight dipoles of charges of magnitude e are placed inside a cube. The total electric flux coming out of the cube will be
|
(a) |
(b) |
(c) |
(d) Zero |
Assertion : The force of repulsion between atomic nucleus and a-particle varies with distance according to inverse square law.
Reason : Rutherford did a-particle scattering experiment.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
The phase difference between alternating emf and current in a purely capacitive circuit will be.
A magnet is dropped down an infinitely long vertical copper tube
|
(a) The magnet moves with continuously increasing velocity and ultimately acquires a constant terminal velocity |
|
(b) The magnet moves with continuously decreasing velocity and ultimately comes to rest |
|
(c) The magnet moves with continuously increasing velocity but constant acceleration |
|
(d) The magnet moves with continuously increasing velocity and acceleration |