Related Questions

Which one of the following principles best describes the basic operation of an electromagnet?
A Current is induced in a conductor that is moving through a magnetic field
B Like magnetic poles repel, while unlike poles attract
C Current flowing through a conductor generates a magnetic field
D Like magnetic poles attract, while unlike poles repel
E None of the above
An electromagnet is created--------electrical current through a coil of wire.
A by passing
B passes by
C to be passed
D passed
Strength of an electromagnet can be increased by
A increasing the cross-sectional area
B increasing the number of turns
C increasing current supply
D all above methods
The core of an electromagnet is said to be in saturation when:
A the core is permitted to move freely within the coil
B an increase in current through the coil causes no further increase in the mmf
C frequent changes in the direction of current through the coil causes heating effects in the core material
D changing the polarity of the current in the coil changes the polarity of the magnetic field around the core
E None of the above
Core of an electromagnet should have
A low coercivity
B high susceptibility
C both of the above
D none of the above
If four triangles are constructed with sides of the length indicated below, which of the following triangles will not be a right triangle ?
A 5, 12, 13
B 8,15, 17
C 3, 4, 5
D 12, 15, 18
If four triangles are constructed with sides of the length indicated below , which of the following triangles will not be a right triangle ?
A 5, 12, 13
B 8, 15, 17
C 12,15, 18
D 3, 4, 5
which of the following angle can be constructed with the help of a ruler and a pair of compasses?
A 35°
B 40°
C 37.5°
D 47.5°
একটি XOR লজিক গেট নিম্নলিখিত কোন লজিক গেট/ গেটগুলোর সমবায়ে গঠিত হতে পারে? (An XOR logic gate can be constructed from the combination of which of the following logic gate/gates?)
A OR gate
B AND gate, OR gate, and NOT gate
C AND gate and NOT gate
D OR gate and NOT gate
Identify the error from the quotation words in the following sentence : A dam is a wall 'constructed' 'across' a valley 'to enclose' an area in which water 'is stored'. No Error.
A constructed
B across
C to enclose
D is stored

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