MCQ on Force acting on conductor in magnetic field and Fleming’s left hand rule

MCQ on Force acting on conductor in magnetic field and Fleming’s left hand rule

MCQ on Force acting on conductor in magnetic field and Fleming’s left hand rule. Practice Force acting on conductor in magnetic field and Fleming’s left hand rule Multiple Choice Questions and Explanation.

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Force acting on conductor in magnetic field and Fleming’s left hand rule MCQ

Dear students, it’s time to explore the logic behind working of many electric appliances used in industries as well as domestic. MCQs in this article will help you to understand the basic of above mentioned things. So let us begin!

Q.1) Current carrying conductor placed in uniform magnetic field is under impact of…..magnetic fields.

a) 1

b) 2

c) 3

d) 4

Ans: b)

Explanation: b) magnetic field due to current and magnetic field due to magnet. i.e. 2 magnetic fields are present in this case.

Q.2) If a straight wire carrying current is suspended between two poles of strong U- shaped magnet, then there will be……..of conductor.

a) motion b) breakage           c) friction                d) none of these.

Ans: a)

Explanation: a) Due to presence of two magnetic fields, the conductor will show certain motion, like vibrational motion of string of guitar.

Q.3) Force on conductor placed in uniform magnetic field can be increased with……..

a) increase in distance

b) decrease in distance

c) increase in current

d) decrease in current.

Ans: c)

Explanation: c) Force acting on conductor placed in uniform magnetic field is proportional to the amount of current that flows in conductor.

Q.4) Force on conductor placed in uniform magnetic field can be increased with……..

a) increase in external magnetic field b) decrease in external magnetic field

c) increase in distance from magnet d) decrease in distance from magnet

Ans: a)

Explanation: a) Force acting on conductor placed in uniform magnetic field is directly proportional to the strength of external magnetic field.

Q.5) Which among the following rules is applicable to study the direction of force, magnetic field and current at a same instant?

a) Right hand thumb rule

b) Palm rule

c) Fleming’s left hand rule

d) Fleming’s right hand rule.

Ans: c)

Explanation: c) Fleming’s left hand rule is used to study the direction of magnetic field, force and current in conductor.

Q.6) In Fleming’s left hand rule, index finger is used to show the direction of……

a) electric current b) magnetic field           c) motion of conductor  d) all of these

Ans: a)

Explanation: a) In Fleming’s left hand rule index finger or fore finger is used to indicate the direction of electric current.

Q.7) In Fleming’s left hand rule, thumb is used to show the direction of……

a) electric current b) magnetic field c) motion of conductor  d) all of these

Ans: c)

Explanation: a) In Fleming’s left hand thumb is used to indicate the direction of motion of conductor.

8) In Fleming’s left hand rule, middle finger is used to show the direction of……

a) electric current b) magnetic field c) motion of conductor  d) all of these

Ans: b)

Explanation: b) In Fleming’s left hand rule middle finger is used to indicate the direction of magnetic field.

Q.9) Direction of motion of conductor in the following figure will be,

a) perpendicular and inwards plane of paper

b) perpendicular and outwards from plane of paper

c) parallel to magnetic field

d) parallel to electric current.

Ans: a)

Explanation: a) According to Fleming’s left hand rule, the direction of motion of conductor shown by thumb should point inwards and perpendicular to plane of paper.

Q.10) Which among the following figure indicates the correct direction of force on conductor, if current is travelling along +Z-axis and magnetic field is towards  X-axis.

Explanation: b) According to Fleming’s left hand rule, the direction of force on conductor shown by thumb which should point + Y-axis.

Q.11) Select the wrong statement from the following for Fleming’s left hand rule.

a) fore finger, middle finger and thumb should be stretched such that they should be perpendicular

b) fore finger, middle finger and thumb should be stretched such that they should be parallel

c) thumb indicates the direction of force acting on the conductor

d) middle finger indicates the direction of current.

Ans: b)

Explanation: b) for Fleming’s left hand rule fore finger, middle finger and thumb should be stretched such that they should be perpendicular.

Q.12) The direction of force acting on conductor can be changed by….

a) changing the direction of current

b) changing the direction of magnetic field

c) both ‘a’ and ‘b’

d) not ‘a’ not ‘b’

Ans: c)

Explanation: c) direction of force acting on conductor can be changed by changing direction both current and magnetic field.

Q.13) In the following figure if the direction of magnetic field is reversed, then the direction of vibration of conductor will be….

a) towards left side of figure

b) towards right side of figure

c) either ‘a’ or ‘b’

d) can not predicted.

Ans: b)

Explanation: b) according to Fleming’s left hand rule, if direction of magnetic field in the above figure is reversed, vibration of wire will be towards the right side of figure as force will be along that direction.

Q.14) What should be the direction of vibration of wire if direction of current is reversed keeping direction of magnetic field unchaged.

a) towards left side of figure

b) towards right side of figure

c) either ‘a’ or ‘b’

d) can not predicted.

Explanation: b) according to Fleming’s left hand rule, if direction of current in the above figure is reversed, vibration of wire will be towards the right side of figure as force will be along that direction.

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