Tag: magnetic effect of electric current

Quizzes (6) Questions (49)

Questions Related to magnetic effect of electric current

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 fleming's left hand rule magnetic force magnetic force on a moving charge and current carrying wire

An electron having a charge e moves with a velocity v in X-direction. A magnetic field acts on it in Y-direction. The force on the electron acts in

  1. positive direction of Y-axis

  2. negative direction of Y-axis

  3. positive direction of Z-axis

  4. negative direction of Z-axis
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
As electron moving in positive x-direction, so the current  is moving in negative x-direction ( the direction of your middle finger) and the magnetic field acts on positive Y-direction ( the direction of your index finger) then thumb will be in negative Z-direction which is the direction of force. 
Multiple choice physics magnetic effect of electric current fleming's left hand rule magnetic force magnetic force on a moving charge and current carrying wire

A positively charged particle falls vertically downwards. The horizontal component of earths magnetic field will deflect it towards

  1. West

  2. East

  3. South

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

Using Fleming's left-hand rule, the force on a positive charge is F = q(v x B). With velocity downwards and the horizontal magnetic field component pointing North, the cross product results in a force directed towards the East.

Multiple choice physics magnetic effect of electric current fleming's left hand rule magnetic force magnetic force on a moving charge and current carrying wire

You are sitting in a room in which a strong magnetic field is directed from your left towards right. A beam of electrons is directed from front towards you. What would be the direction of magnetic force on this beam ?

  1. downwards.

  2. upwards.

  3. towards right

  4. towards left

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
The direction of the magnetic field is from left to right, the direction of the beam of electrons is from your front hence the direction of the current is from back to front. Now by applying Fleming left hand rule we can find that the direction of the magnetic force on the beam of electron is downwards.