MCQ Questions for Class 12 Physics Chapter 4 Moving Charges and Magnetism Part-1 with Answers

Moving Charges and Magnetism Part-1 Class 12 Physics MCQs Questions with Answers

Check the below NCERT MCQ Questions for Class 12 Physics Chapter 4 Moving Charges and Magnetism Part-1 with Answers Pdf free download. MCQ Questions for Class 12 Physics with Answers were prepared based on the latest exam pattern. We have Provided Moving Charges and Magnetism Part-1 Class 12 Physics MCQs Questions with Answers to help students understand the concept very well.

Class 12 Physics Chapter 4 Quiz

Class 12 Physics Chapter 4 MCQ Online Test

You can refer to NCERT Solutions for Class 12 Physics Chapter 4 Moving Charges and Magnetism Part-1 to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.

Moving Charges and Magnetism Part-1 Class 12 Physics MCQ online test

Q1.	The current sensitibility of a moving coil galanometer increases with decrease in:
	A.magnetic field
	B.area of a coil
	C.number of turns
	D.None of these

Ans: None of these

Q2.	A current carring coil is placed in a uniform magnetic field. If the coil turns through an angle θ, then the torque is directly proportional to:
	A.sin θ
	B.cos θ
	C.cot θ
	D.tan θ

Ans: cos θ

Q3.	The sensitivity of a tangent galvanometer can be increased by increasing:
	A.the radius of the coil
	B.the external magnetic field
	C.the number of turns of the coil
	D.all the above

Ans: the external magnetic field

Q4.	The permeability of a paramagnetic substance is:
	A.very large
	B.small but more than unity
	C.less than unity
	D.negative

Ans: small but more than unity

Q5.	Which of the following shows that the earth behaves as a magnet?
	A.Repulsion between like poles .
	B.Attraction between unlike poles
	C.Null points in the magnetic field of a bar magnet
	D.No existence of isolated magnetic poles

Ans: Null points in the magnetic field of a bar magnet

Q6.	What is the angle of dip at the magnetic poles ?
	A.30°
	B.0°
	C.45°
	D.None of these

Ans: None of these

Q7.	A charged particle of mass m and charge q travels on a circular path of radius r i.e., perpendicular to the magnetic field B. The time taken by particle to complete on revolution is :
	A.\(\frac{2πqB}{m}\)
	B.\(\frac{2πm}{qB}\)
	C.\(\frac{2πmq}{B}\)
	D.\(\frac{2πq^2B}{m}\)

Ans: \(\frac{2πm}{qB}\)

Q8.	Circular loop of radius 0.0157 m carries a current 2 A. The magnetic field at the centre of the loop is :
	A.1.57 × 10^-3Wb/m²
	B.8.0 × 10^-5 Wb/m²
	C.2.0 × 10^-3 Wb/m²
	D.3.l4 × 10^-1 Wb/m²

Ans: 8.0 × 10^-5 Wb/m²

Q9.	What happens to the magnetic field at the centre of a circular current carrying coil if we double the radius of the coil keeping the current unchanged?
	A.halved
	B.doubled
	C.quadrupled
	D.remains unchanged

Ans: halved

Q10.	When we double the radius of a coil keeping the current through it unchanged, what happens to the magnetic field directed along its axis at far off points?
	A.halved
	B.doubled
	C.quadrupled
	D.remains unchanged

Ans: remains unchanged

Q11.	The strength of the magnetic field around an infinite current carrying conductor is :
	A.same everywhere
	B.inversely proportional to the distance
	C.directly proportional to the distance
	D.None of these

Ans: inversely proportional to the distance

Q12.	A current carrying power line carries current from west to east. Then the direction of the magnetic field 2 m above it is :
	A.west to east
	B.south to north
	C.north to south
	D.None of these

Ans: north to south

Q13.	The force between two parallel current carrying conductors is F. If the current in each conductor is doubled, then the force between them becomes :
	A.4F
	B.2F
	C.F
	D.\(\frac{F}{4}\)

Ans: 4F

Q14.	How much force will be experienced by a moving charge in a magnetic field? The symbols have their usual meanings.
	A.\(\vec{F}\) = q(\(\vec{v}\).\(\vec{B}\))
	B.\(\vec{F}\) = \(\frac{q}{(\vec{v}.\vec{B})}\)
	C.\(\vec{F}\) = \(\frac{q}{2}\)\((\vec{v}×\vec{B}\))
	D.\(\vec{F}\) = q(\(\vec{v}\)×\(\vec{B}\))

Ans: \(\vec{F}\) = q(\(\vec{v}\)×\(\vec{B}\))

Q15.	Which of the following is not a unit of magnetic induction?
	A.gauss
	B.tesla
	C.oersted
	D.weber/metre²

Ans: oersted

Q16.	The magnetic field produced by an / meter long straight (x cry thin) current (I) carry ing conductor at any point on itself is :
	A.zero
	B.infinite
	C.\(\frac{µ_0l}{4πl}\)
	D.\(\frac{µ_0l}{2πl}\)

Ans: zero

Q17.	A charge + q is sent through a magnetic field. The force acting on it is maximum w hen the angle between the direction of motion of the charged particle and the magnetic field :
	A.0°
	B.45°
	C.90°
	D.180°

Ans: 90°

Q18.	An electron having mass ‘m’ and Kinetic energy E enters in uniform magnetic field B perpendicular, then its frequency will be:
	A.\(\frac{eE}{qmB}\)
	B.\(\frac{2πm}{eB}\)
	C.\(\frac{eB}{2πm}\)
	D.\(\frac{2m}{eBE}\)

Ans: \(\frac{eB}{2πm}\)

Q19.	A wire of length 2 metre carries a current 1 ampere, is bent to form a circle. The magnetic moment of the coil is :
	A.2π
	B.π/2
	C.π/4
	D.1/π

Ans: 1/π

Q20.	The magnetic field of a given length of a ware for single turn coil at its centre is B. Then.its value for two turns of coil will be :
	A.B/4
	B.B/2
	C.4B
	D.2B