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Standard XII
Physics
NCERT
Question

Assertion: A magnet suspended freely in an uniform magnetic field experiences no net force, but a torque that tends to align the magnet along the field when it is deflected from equilibrium position

Reason: Net force mB−mB=0 but the forces on north and south poles being equal, unlike and parallel make up a couple that tends to align the magnet, along the field


  1. Both A and R are true and R is the correct explanation of A
  2. Both A and R are true and R is not correct explanation of A
  3. A is true, but R is false
  4. A is false, but R is true

A
Both A and R are true and R is the correct explanation of A
B
A is true, but R is false
C
Both A and R are true and R is not correct explanation of A
D
A is false, but R is true
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Similar Questions
Q1

Assertion: A magnet suspended freely in an uniform magnetic field experiences no net force, but a torque that tends to align the magnet along the field when it is deflected from equilibrium position

Reason: Net force mB−mB=0 but the forces on north and south poles being equal, unlike and parallel make up a couple that tends to align the magnet, along the field


View Solution
Q2
Assertion: On freely suspending a current – carrying solenoid, it comes to rest in Geographical N-S direction.
Reason : One end of current carrying straight solenoid behaves as a North pole and the other end as a South pole, just like a bar magnet.
[1 Mark]

(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true and R is not the correct explanation of A
(c) A is true but R is false
(d) A is False but R is true
View Solution
Q3
Assertion (A) : Fruits detach when the branch is shaken forcefully.
Reason (R) : Branch tends to remain at rest and the fruits come in motion.

Choose the correct option.
(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 but R is true
[1 Mark]




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Q4

In the following question, a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below in each question.

Assertion (A) Three states of matter are the result of the balance between intermolecular forces and thermal energy of the molecules.

Reason (R) Intermolecular forces tend to keep the molecules together but the thermal energy of molecules tends to keep them apart.

(a) Both A and R are true and R is the correct explanation of A

(b) Both A and R are true and R is not the correct explanation of A

(c) A is true but R is false

(d) A is false but R is true

View Solution
Q5
Assertion (A) : A man standing on a completely frictionless surface can propel himself by whistling.
Reason (R) : If no external force acts on a system, its momentum cannot change. Codes
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