Tag: oersted experiment

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Multiple choice physics magnetic effect of electric current oersted experiment oersted's experiment magnetic field due to a straight current carrying conductor

A compass needle placed at a distance $r$ from a short magnet in $\tan\ A$ position shown a deflection of $60^{o}$. If the distance is increased to $r(3)^{1/3}$, then the deflected of the compass needle is:

  1. $30^{o}$
  2. $60^{o}\ \times (3)^{1/3}$
  3. $60^{o}\ \times (3)^{2/3}$
  4. $90^{o}\ \times (3)^{1/3}$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

For a short magnet in the tan A position, the magnetic field B is proportional to 1/r^3. Since B = B_h * tan(theta), tan(theta) is proportional to 1/r^3. If r increases to r * (3)^(1/3), r^3 increases by a factor of 3, so tan(theta) decreases by a factor of 3. tan(60) = sqrt(3), so the new tan(theta) = sqrt(3)/3 = 1/sqrt(3), which corresponds to 30 degrees.

Multiple choice physics magnetic effect of electric current oersted experiment oersted's experiment magnetic field due to a straight current carrying conductor

Electromagnet can be formed due to which of the following?

  1. Heating effect of current

  2. Magnetic effect of current

  3. Chemical effect of current

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Electromagnets are formed by passing an electric current through a wire coiled around the substance with iron core. The electric current generates a magnetic field around the  substance and thus magnetize it which convert it into a magnet. Thus electromagnet can be formed due to the magnetic effect of current.

Multiple choice physics magnetic effect of electric current oersted experiment oersted's experiment magnetic field due to a straight current carrying conductor

If we change in the direction of the current passing through the wire near to the magnetic needle:

  1. position of the pole of the needle will change

  2. position of the pole of the needle will remain same

  3. change in position of the pole depends on the current intensity

  4. none of the above is correct
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When the direction of the current flowing through the wire is reversed, direction of the magnetic field, so produced, also changes its direction which results in changing the position of pole of needle kept near the wire.

Multiple choice physics magnetic effect of electric current oersted experiment oersted's experiment magnetic field due to a straight current carrying conductor

A magnetic needle vibrates in a vertical plane parallel to the magnetic meridian about horizontal axis passing through its centre. The frequency is $\pi$. If the plane of oscillation turned about a vertical axis by ${90}^{o}$, the frequency of oscillation in vertical plane will be:

  1. $\pi$

  2. zero
  3. less than $\pi$
  4. more than $\pi$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Frequency $\pi=\dfrac{1}{2\pi}\sqrt{\dfrac{BM}I}$

On turning through angle $90°$, effective field is $V$ and $B>V$
$\implies $ new frequqncy $<\pi$ (less than $\pi)$

Multiple choice physics magnetic effect of electric current oersted experiment oersted's experiment magnetic field due to a straight current carrying conductor

What did Oersted conclude from the experiment ?

  1. The current carrying wire must be acting as a magnet for the compass needle to deflect.

  2. The current carrying wire gets heated up and causes the compass needle to deflect.

  3. The current carrying wire sets up air currents that makes the compass needle to deflect.

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The deflection of the compass needle, whenever there is current in the wire show that a current carrying wire produces a magnetic field around it, which is essentially saying the current carrying wire must be acting as a magnet.

Multiple choice physics electromagnetic forces oersted experiment oersted's experiment magnetic field due to a straight current carrying conductor

Who discovered the relationship between electricity and magnetism

  1. Faraday

  2. Newton

  3. Maxwell

  4. Oersted
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Answer is D.

Electromagnetism is the study of the electromagnetic force which is a type of physical interaction that occurs between electrically charged particles. 
Hans Christian Oersted discovered the relationship between electricity and magnetism in 1820.

Multiple choice physics electromagnetic forces oersted experiment oersted's experiment magnetic field due to a straight current carrying conductor

Who discovered the relationship between electricity and magnetism?

  1. Faraday

  2. Newton

  3. Maxwell

  4. Oersted
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Answer is D.

Electromagnetism is the study of the electromagnetic force which is a type of physical interaction that occurs between electrically charged particles. 
Hans Christian Oersted discovered the relationship between electricity and magnetism in 1820.

Multiple choice physics electromagnetic forces oersted experiment oersted's experiment magnetic field due to a straight current carrying conductor

With _____ in current in a wire near to magnetic needle, _____the vibration in the needle. Fill in the blank.

  1. increase, decreases

  2. increase, increases

  3. decrease, increases

  4. Non of above

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

More is the current in the wire near to the magnetic field, more is the strength of magnetic field generated around the wire and thus more is the vibration in the needle.

Multiple choice physics electromagnetic forces oersted experiment oersted's experiment magnetic field due to a straight current carrying conductor

What did Orested do in the experiment ?

  1. Placed a compass near an electromagnet and observed its deflection

  2. Placed a compass near a magnet and observed the deflection of compass needle

  3. Placed a compass near a current carrying wire and observed the deflection of compass needle

  4. Placed a compass near an electrolyte and observed the deflection of compass needle
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Hans Christian Oersted. Hans Christian Oersted began a new scientific epoch when he discovered that electricity and magnetism are linked. He showed by experiment that an electric current flowing through a wire could move a nearby magnet.Oersted's experiment that when an electric current is passed through a conducting wire, a magnetic field is produced around it. The presence of magnetic field at a point around a current carrying wire can be detected with the help of a compass needle

Multiple choice physics electromagnetic forces oersted experiment oersted's experiment magnetic field due to a straight current carrying conductor

The amount of deflection of the magnetic needle in a galvanoscope depends on:

  1. The amount of current passing through the insulated copper wire that is wound over it

  2. Magnetic strength of the magnetic needle

  3. Number of turns of the coil

  4. All the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The deflection in galvanometer is the defined by 

$\tau=NBIA$
The N is number of turns of coils.
B is magnetic strenght of magnetic needles 
I is The amount of current passing through the insulated copper wire that is wound over it
A is area of coil contact with magnetic field.