Tag: magnetic effect of electric current

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Questions Related to magnetic effect of electric current

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

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

  1. motion

  2. magnetic field

  3. current

  4. none
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

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

  1. thumb

  2. fore finger

  3. middle finger

  4. none
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

  1. South

  2. North

  3. East

  4. West
Reveal answer Fill a bubble to check yourself
A Correct answer
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 .

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

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

  1. Force, Magnetic

  2. Force , Electric

  3. Torque, Magnetic

  4. Torque, Electric
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Fleming's left-hand rule is a mnemonic used to determine the direction of the magnetic force acting on a current-carrying conductor placed within a magnetic field.

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

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

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

The force F = q(v x B). Given velocity v = 5j and B = 2i + 3j + 4k, the cross product v x B = 5j x (2i + 3j + 4k) = 10(j x i) + 15(j x j) + 20(j x k) = -10k + 0 + 20i. The resulting vector (20i - 10k) lies in the zx plane.

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

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

The magnetic force on a moving charge is F = q(v x B). If the charge moves parallel to the magnetic field, the angle between v and B is 0 degrees, so the cross product (and thus the force) is zero.

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 oersted experiment oersted's experiment magnetic field due to a straight current carrying conductor

Which of the following is/are correct?

  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
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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.