10 Questions MCQ Test Physics Class 12 - Test: Solenoid & Toroid
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The magnetic field inside a toroidal solenoid of radius R is B. If the current through it is doubled and its radius is also doubled keeping the number of turns per unit length the same; magnetic field produced by it will be:
Detailed Solution for Test: Solenoid & Toroid - Question 1
The force between two current carrying conductors is due to which of the following
Detailed Solution for Test: Solenoid & Toroid - Question 2
we can say that any two current carrying conductors when placed near each other, will exert a magnetic force on each other.
Consider the system shown in the figure above. Here, we have two parallel current carrying conductors, separated by a distance ‘d’, such that one of the conductors is carrying a current I1 and the other is carrying I2, as shown in the figure. From the knowledge gained before, we can say that the conductor 2 experiences the same magnetic field at every point along its length due to the conductor 1. The direction of magnetic force is indicated in the figure and is found using the right-hand thumb rule. The direction of the magnetic field, as we can see, is downwards due to the first conductor.
What is the magnetic field in the empty space enclosed by the toroidal solenoid of radius R?
Detailed Solution for Test: Solenoid & Toroid - Question 4
The magnetic field is only confined inside the body of a toroid in the form of concentric magnetic lines of force. For any point inside the empty space surrounded by toroid and outside the toroid, the magnetic field B is zero because the net current enclosed in these spaces is zero. Thus, the magnetic moment of the toroid is zero.
The magnetic field inside a current carrying toroidal solenoid is B, if its radius is doubled and the current through it is also doubled keeping the total number of turns same, the magnetic field inside the solenoid will be:
Detailed Solution for Test: Solenoid & Toroid - Question 5
Magnetic field due to a current carrying toroidal solenoid is independent of:
Detailed Solution for Test: Solenoid & Toroid - Question 7
For a toroidal solenoid, B=μ0nI
Where, B is the magnetic field, μ0 is the permeability of free space, n is the number of coils in the solenoid per length (like 2 turns per millimetre, let's say), and I is the electric current.
i.e. It does not depend upon its radius.
In a current carrying conductor varying electric field generates
Detailed Solution for Test: Solenoid & Toroid - Question 8
In a current-carrying conductor, by varying the electric current, the magnetic field is generated. The direction of the magnetic field generated will be perpendicular to the conductor.
The direction of the magnetic field can be determined as wrapping the right-hand fingers around the wire and the direction of the current is indicated by the thumb.
Ampere’s law is used for determining the magnetic field of a long conductor:
Detailed Solution for Test: Solenoid & Toroid - Question 9
It is true only for an infinitely long solenoid.
Magnetic field at any point is the summation of magnetic fields produced by each turn of the wire of the solenoid.
Now imagine a solenoid in front of you stretching to infinity on both the sides, say from left to right. An infinitely long solenoid has no ends and the field everywhere inside it is the same and let its intensity be E. Now cut the solenoid at a point in front of you and throw (!) the half away. You now have in front of you, an end of the remaining half. The field at this end is now due to half the total turns and hence it is E/2.
Detailed Solution for Test: Solenoid & Toroid - Question 10
A toroid is shaped like a solenoid bent into a circular shape such as to close itself into a loop-like structure. The toroid is a hollow circular ring, as can be seen in the image shown below, with a large number of turns of enamelled wire, closely wound with negligible spacing between any two turns.
The magnetic field inside and outside the toroid is zero. The magnetic field inside the toroid, along the circular turn, is constant in magnitude and its direction inside the toroid is clockwise as per the right-hand thumb rule for circular loops.
The magnetic field due to a toroid can be given as,
Where N is the number of turns of the toroid coil, I is the amount of current flowing and r is the radius of the toroid.
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