Download the chapter on Moving Charges And Magnetism from the CBSE Class 12 Physics Assertion Reason Questions. Class 12 Physics Assertion Reason Questions with Answers were created using the most recent exam format. To gauge their degree of preparedness, students can complete the NCERT Class 12 Physics Chapter 4 Moving Charges And Magnetism.
Moving Charges And Magnetism Class 12 Assertion Reason Questions
The following questions consist of two statements – Assertion (A) and Reason (R). Answer these questions by selecting the appropriate option given below:
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false and R is also false.
Assertion (A): A charged particle experiences a force when moving through a magnetic field.
Reason (R): The force on a charged particle in a magnetic field is given by the equation F = q(v × B), where q is the charge, v is the velocity of the particle, and B is the magnetic field.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): The force on a charged particle due to a magnetic field is always perpendicular to both the velocity of the particle and the direction of the magnetic field.
Reason (R): The force experienced by a charged particle moving in a magnetic field follows the right-hand rule, where the force is perpendicular to both v and B.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): The magnetic force on a charged particle is zero when the particle moves parallel to the magnetic field.
Reason (R): The cross product of two parallel vectors is zero, and hence the force on a charged particle moving parallel to the magnetic field is zero.
Answer: (c) A is true but R is false.
Assertion (A): The magnetic force on a charged particle is maximum when the particle moves perpendicular to the magnetic field.
Reason (R): When the charged particle moves perpendicular to the magnetic field, the sine of the angle between v and B is maximum, resulting in the maximum magnetic force.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): A magnetic field can change the speed of a charged particle.
Reason (R): A magnetic field exerts a force on a charged particle, which can change the direction of its velocity, but not its speed.
Answer: (c) A is true but R is false.
Assertion (A): Magnetic field lines are continuous closed loops.
Reason (R): Magnetic field lines do not have starting or ending points and always form closed loops.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): The strength of the magnetic field decreases with an increase in the distance from the magnet.
Reason (R): The magnetic field strength follows the inverse-square law, and it decreases with the square of the distance from the magnet.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): A magnetic dipole is formed when a current-carrying loop is placed in a magnetic field.
Reason (R): A current-carrying loop produces a magnetic dipole moment due to the circulating current.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): A charged particle moving in a straight line cannot be influenced by a magnetic field.
Reason (R): For a charged particle to experience a magnetic force, it must have a component of velocity perpendicular to the magnetic field.
Answer: (c) A is true but R is false.
Assertion (A): The magnetic field inside a long solenoid is uniform and parallel to its axis.
Reason (R): In a long solenoid, the magnetic field lines are parallel and closely packed together, resulting in a uniform magnetic field inside.
Answer: (a) Both A and R are true and R is the correct explanation of A.
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