Tag: magnetic field on the axis of a toroid

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Questions Related to magnetic field on the axis of a toroid

Multiple choice physics magnetic effect of electric current magnetic field due to a circular current carrying conductor magnetic field produced in a circular loop field due to a current carrying coil magnetic field lines due to current magnetic field due to current carrying conductor magnetic field on the axis of a toroid

Why does toroid have a higher magnetic field than a solenoid?

  1. It is magnetically efficient.

  2. It is a straight core.

  3. It has an open loop core.

  4. It has a closed loop core.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Due to the symmetry and being closed loop core.
Totoid has higher magnetic field and thus higher inductor and Q-facator
Multiple choice physics magnetic effect of electric current magnetic field due to a circular current carrying conductor magnetic field produced in a circular loop field due to a current carrying coil magnetic field lines due to current magnetic field due to current carrying conductor magnetic field on the axis of a toroid

Which among the following is not an electronic component used in constructing a toroid?

  1. copper wires

  2. laminated iron

  3. ferrite core

  4. aluminium powder
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Toroids are inductors and transformers which use magnetic cores.
These cores are of ferromagnetic material such as
Laminated iron, iron powder or ferrite.
Multiple choice physics magnetic effect of electric current magnetic field due to a circular current carrying conductor magnetic field produced in a circular loop field due to a current carrying coil magnetic field lines due to current magnetic field due to current carrying conductor magnetic field on the axis of a toroid

The leakage flux of a toroid is less because

  1. It is asymmetrical.

  2. It has an open-loop core.

  3. It is symmetrical.

  4. It has a straight core.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Toroidal is a surface of revolution with hole in middle.
This is a solid body used for toroid production.
The advantage of this shape is that, due to its symmetry amount of magnetic flux that escapes outside is low.
Multiple choice physics magnetic effect of electric current magnetic field due to a circular current carrying conductor magnetic field produced in a circular loop field due to a current carrying coil magnetic field lines due to current magnetic field due to current carrying conductor magnetic field on the axis of a toroid

Which of the following is true for a toroid?

  1. low inductance and Q factor

  2. high inductance and Q factor

  3. high inductance and low Q-factor

  4. low inductance and high Q-factor
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Due to the symmetry and being closed loop core.
Toroid has higher magnetic field and thus higher inductor and Q-factor

Multiple choice physics magnetic effect of electric current magnetic field due to a circular current carrying conductor magnetic field produced in a circular loop field due to a current carrying coil magnetic field lines due to current magnetic field due to current carrying conductor magnetic field on the axis of a toroid

A toroid is                  solenoid

  1. a finite

  2. an endless

  3. straight

  4. either A or B
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A Toroid is a solenoid which is bent in the form of a ring with its both the ends joined together.  Since both the ends are merged, it appears endless.

Multiple choice physics magnetic effect of electric current magnetic field due to a circular current carrying conductor magnetic field produced in a circular loop field due to a current carrying coil magnetic field lines due to current magnetic field due to current carrying conductor magnetic field on the axis of a toroid

A solenoid of length 0.4 m, having 500 turns and 3A current flows through it. A coil of radius 0.01 m and have 10 turns and carries current of 0.4 A has to placed such that its axis is perpendicular to the axis of solenoid ,then torque on coil will be

  1. $5.92\times 10^{-7} N.m$

  2. $5.92\times 10^{-5} N.m$

  3. $5.92\times 10^{-4} N.m$

  4. $5.92\times 10^{-3} N.m$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Magnetic field due to larges solenoid
$B=\dfrac {\mu _{0} NI}{l}=\dfrac {4\times 10^{-7}\times 500 \times 3}{0.4}$
$N=500$ 
$I=3$
$l=0.4$
Torque $M$ solenoid $I\times $ Area of corn section $\times B$
$=0.4\times \pi 0.01^{2}\times 4\pi \times \dfrac{10^{-7}\times 500 \times 3}{0.4}$
 orque $=\pi.0.01^{2} \times 4\pi \times 10^{-7}\times 500 \times 3$
Torque $=5.92\times 10^{-7}N-m$
Multiple choice physics magnetic effect of electric current magnetic field due to a circular current carrying conductor magnetic field produced in a circular loop field due to a current carrying coil magnetic field lines due to current magnetic field due to current carrying conductor magnetic field on the axis of a toroid

A coil of many circular turns of wire wrapped in a shape of a cylinder forms a ______

  1. torroid

  2. solenoid

  3. conductor

  4. insulator
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A solenoid is a long coil of wire wrapped in a cylindrical shape, which creates a uniform magnetic field inside when current flows through it.

Multiple choice physics magnetic effect of electric current magnetic field due to a circular current carrying conductor magnetic field produced in a circular loop oersted experiment magnetic field lines due to current magnetic field due to current carrying conductor magnetic field on the axis of a toroid

A loosely wound helix made of stiff wire is mounted vertically with the lower end just touching a dish of mercury when a current from the battery is started in the coil through the mercury

  1. the wire oscillates

  2. the wire continues making contact

  3. the wire breaks contact just when the current is passed

  4. the mercury will expand by heating due to passage of current
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

According to the Biot Savart's law, a current carrying conductor produces a magnetic field in its surroundings. This will cause the helix to oscillate across a mean position.

Multiple choice physics magnetic effect of electric current magnetic field lines due to current magnetic field due to current carrying conductor magnetic field on the axis of a toroid

A long solenoid carrying a current produces a magnetic field B along its axis. If the current is doubled and the number of turns per cm is halved, the new value of the magnetic field is

  1. 4 B

  2. B/2

  3. B

  4. 2 B
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

$\displaystyle B = \mu _0 N _0  i;   $

$B _1 = (\mu _0) \left ( \dfrac{N _0}{2} \right ) (2 i) $

$= \mu _0 N _0 i = B$


$\Rightarrow B _1 = B$

Multiple choice physics magnetic effect of electric current magnetic field lines due to current magnetic field due to current carrying conductor magnetic field on the axis of a toroid

A wire 28 m long is bent into N turns of circular coil of diameter 14 cm forming a solenoid of length 60 cm. Calculate the magnetic field inside it when a current of 5 amp passed through it.  $(\mu _0 = 12.57 \times 10^{-7} m^{-1})$

  1. <span>$6.67 \times10^{-1} T$</span>

  2. <span>$6.67 \times10^{-4} T$</span>

  3. <span>$6.67 \times10^{4} T$</span>

  4. <span>$2.67 \times10^{-4} T$</span>
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Given $d = 14 cm=0.14 m$    

           $l = 60cm = 0.6 m$

By the question, $N \times \pi d = 28 m.$

$N \times \pi \times 0.14 = 28$

$\displaystyle \therefore N = \dfrac{28}{0.14 \times \pi} = 63.66 turns$

$\displaystyle B = \mu _o   nI  =\mu _o  \dfrac{N}{l} I = 12.57 \times 10^{-7} \times \dfrac{63.66}{0.6} \times 5$

$=6.67 \times10^{-4} T$