Physics
Grade-10
Easy
Question
Read the following statements and choose the correct option:
Assertion: The strength of an electromagnet depends on the magnitude of current flowing through the solenoid.
Reason: Electromagnet is a permanent magnet.
- Both A and R are true, and R is the correct explanation of A.
- Both A and R are true, but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Hint:
Electromagnet, device consisting of a core of magnetic material surrounded by a coil through which an electric current is passed to magnetize the core. An electromagnet is used Wherever controllable magnets are required, as in contrivances in which the magnetic flux is to be varied, reversed, or switched on and off
The correct answer is: A is true but R is false.
The strength of an electromagnet depends on:
- The strength of the current passing through the coil, the greater the current, the greater the strength. This because the current increases there is more flow of electrons which in turn increases the magnetic field around it.
- The number of turns in the coils, the greater the number of coils, the greater the strength. This is because more the number of coils, more uniformity is obtained in the magnetic field and hence it is more stronger.
- An electromagnet is called a temporary magnet because it produces a magnetic field only when the current flows in its coil
- So A is true but R is false.
- Whether the core is made up of a soft or hard magnetic material. Soft iron core magnetizes more quickly than hard magnetic materials like steel.
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Match the following with the correct response.
(1) Magnetic field inside the solenoid (A) Small bar magnet capable of rotating freely
(2) Compass needle (B) Temporary magnet
(3) Solenoid with soft iron core (C) Uniform
Match the following with the correct response.
(1) Magnetic field inside the solenoid (A) Small bar magnet capable of rotating freely
(2) Compass needle (B) Temporary magnet
(3) Solenoid with soft iron core (C) Uniform
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Read the following statements and choose the correct option:
Statement A: The magnetic field produced by a current-carrying loop has no poles.
Statement B: Like poles of magnets repel each other.
Read the following statements and choose the correct option:
Statement A: The magnetic field produced by a current-carrying loop has no poles.
Statement B: Like poles of magnets repel each other.
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The magnetic field lines outside a solenoid carrying current:
The magnetic field lines outside a solenoid carrying current:
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The material of the core of an electromagnet is generally:
The material of the core of an electromagnet is generally:
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Electromagnet loses its magnetic property when:
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A bar magnet is equivalent to:
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The nature of magnetic field line passing through the center of current carrying circular loop is:
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The symbol ⊗ shows that there is:
The symbol ⊗ shows that there is:
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On reversing the direction of current in a wire, the magnetic field produced by it:
On reversing the direction of current in a wire, the magnetic field produced by it:
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Which of the following should be used as the core of an electromagnet?
Which of the following should be used as the core of an electromagnet?
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When an electric current passes through a solenoid, it acts as a/an:
When an electric current passes through a solenoid, it acts as a/an:
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In a uniform magnetic field, the field lines are:
In a uniform magnetic field, the field lines are:
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Electromagnets are special types of magnets in which magnetism is produced by:
Electromagnets are special types of magnets in which magnetism is produced by:
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The observations made by Faraday from the experiments on electromagnetic induction is (are) that ___________.
I. The deflection in the galvanometer increases when a strong magnet is used.
II. The induced current in the coil is alternating in nature.
The observations made by Faraday from the experiments on electromagnetic induction is (are) that ___________.
I. The deflection in the galvanometer increases when a strong magnet is used.
II. The induced current in the coil is alternating in nature.
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Two identical coaxial circular loops carry a current “I” each, circulating in the same direction. If the loops approach each other, what will you observe?
Two identical coaxial circular loops carry a current “I” each, circulating in the same direction. If the loops approach each other, what will you observe?
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