Tag: magnetic effect of electric current

Questions Related to magnetic effect of electric current

In the statement of Fleming's left hand rule, what do the direction of centre finger represents

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

  1. motion

  2. magnetic field

  3. current

  4. none

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Correct Option: C
Explanation:

The direction of the current and that of the magnetic field perpendicular to each other and found that the force is perpendicular to both of them. The three directions can be illustrated through a simple rule, called Flemings left-hand rule. According to this rule, stretch the thumb, forefinger and middle finger of your left hand such that they are mutually perpendicular. If the first finger points in the direction of magnetic field and the second finger in the direction of the current, then the thumb will point in the direction of motion or the force acting on the conductor.

In the statement of Fleming's left hand rule, force acting on the conductor is  is represented by

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

  1. thumb

  2. fore finger

  3. middle finger

  4. none

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Correct Option: A
Explanation:

The direction of the current and that of the magnetic field perpendicular to each other and found that the force is perpendicular to both of them. The three directions can be illustrated through a simple rule, called Flemings left-hand rule. According to this rule, stretch the thumb, forefinger and middle finger of your left hand such that they are mutually perpendicular. If the first finger points in the direction of magnetic field and the second finger in the direction of the current, then the thumb will point in the direction of motion or the force acting on the conductor.

An electron is moving towards east in a magnetic field acting vertically downwards. So the electron is deflected towards:

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

  1. South 

  2. North

  3. East

  4. West

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Correct Option: A
Explanation:

An electron is moving towards east in a magnetic field acting vertically downwards. So, the electron is deflected in a mutually perpendicular direction to magnetic field. Using Fleming's left hand rule it is in south direction .

Fleming's left-hand rule is used to find the direction of _______ acting on the current carrying conductor placed in a/an ________ field.

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

  1. Force, Magnetic

  2. Force , Electric

  3. Torque, Magnetic

  4. Torque, Electric

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Correct Option: A

At an instant a charge q moves with a velocity of 5 m/s along y-axis in a uniform magnetic filed $\underset{B}{\rightarrow}=(2\widehat{i}+3\widehat{j}+4\widehat{k})$

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

  1. The charge will experience a force in xy plane

  2. The charge will experience a force in yz plane

  3. The charge will experience a force in zx plane

  4. The charge will experience a force along x-axis

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Correct Option: C

A charge particle is moving in the direction of a magnetic filed.The magnetic force acting on the particle:

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

  1. is in the direction of its velocity

  2. is in the direction opposite to its velocity

  3. is perpendicular to its velocity

  4. is zero

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Correct Option: D

According to Fleming's left hand rule,whose direction is indicated by thumb?

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

  1. $ Electric current O $

  2. $ Magnetic force O $

  3. $ Magnetic field O $

  4. $ None of these O $

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Correct Option: C

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

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

  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

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Correct Option: A
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.

Which of the following is/are correct?

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

  1. Electric current can produce a magnetism

  2. Due to change in current the magnetic strength changes

  3. Magnetic strength of a magnet is independent of the number of turn in the current carrying coil

  4. All of the above

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Correct Option: D
Explanation:

I)According to Oersted experiment electric current can produce magnetism.

iI)Magnetic induction $B \alpha I$
If current changes the strength $B$ changes.
iiI)For circular coil magnetic field $B$ due to single ring $B=\dfrac{\mu _0 i}{2r}$
If magnet contain n turn then its strength is $B _2=nB$
But if current carrying coil have $n _2$ turn then strength doesn't change.
$B _2=nB$
Hence all options are correct.

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:

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

  1. $30^{o}$

  2. $60^{o}\ \times (3)^{1/3}$

  3. $60^{o}\ \times (3)^{2/3}$

  4. $90^{o}\ \times (3)^{1/3}$

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Correct Option: A