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Physics 10 Chapter 15 - Electromagnetism - 7
1.
The total force acting on the armature can be decreased by.....................?
a) Increasing the strength of the magnetic field
b) Increasing the area of the coil
c) Increasing the current in the coil
d) Decreasing the number of turns of the coil
2.
The total force acting on the armature can be decreased by.....................?
a) Decreasing the current in the coil
b) Increasing the strength of the magnetic field
c) Increasing the number of turns of the coil
d) Increasing the area of the coil
3.
The total force acting on the armature can be decreased by.....................?
a) Increasing the number of turns of the coil
b) Increasing the area of the coil
c) Increasing the current in the coil
d) Decreasing the strength of the magnetic field
4.
What is engraved on bank credit cards?
a) Paper strip
b) Magnetic strip
c) Plastic strip
d) Electric strip
5.
The total force acting on the armature can be decreased by.....................?
a) Increasing the strength of the magnetic field
b) Decreasing the area of the coil
c) Increasing the current in the coil
d) Increasing the number of turns of the coil
6.
Who discovered that an electric current through a conductor produces a magnetic field around it?
a) Hans Christian Oersted
b) Archimedes
c) Newton
d) Pascal
7.
Who discovered that an electric current through a conductor produces a magnetic field around it?
a) Archimedes
b) Pascal
c) Ampere
d) Newton
8.
From following laws, which is the discovery of Faraday?
a) Laws of electromagnetic induction
b) Laws of motions
c) Laws of mirrors
d) Laws of reflection
9.
Who thought that the magnetic field can also produce an electric current?
a) Archimedes
b) Pascal
c) Michael Faraday
d) Newton
10.
Faraday was .................. physicist?
a) British
b) German
c) American
d) French
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