Given below are two statements labelled as Assertion (A) and Reason (R) Select the most appropriate answer from the options 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.
45. Assertion (A): Magnetic moment of a bar magnet decreases with length.
Reason (R): Magnetic strength decreases as magnetic moment decreases.
46. Assertion (A): When two bodies are rubbed together body A acquires q1 and body B acquires q2 then q1+ q2 = 0
Reason (R): Irrespective of the charge enclosed by the surface, total flux through the surface is zero.
47. Assertion (A): Kirchhoff's junction law follows conservation of charge. Reason (R): Kirchhoff's loop Law follows conservation of energy.
48. Assertion (A): Magnetic force is always
perpendicular to magnetic field.
Reason (R): Electric force is along the direction of electric field.
to magnetic
49. Assertion (A): In standard resistors, constanton and manganin are widely used.
Reason (R): For smallest change in temperature, the value of resistance changes for constantan and manganin.
Answers
Answer:
A is the correct answer
Explanation:
please mark it as the brainliest answer
45) d) magnetic moment of a bar magnet is directly proportional to the length of the bar magnet but its magnetic strength doesn't depend upon its length.
46) a) flux passing through anybody will depend upon the charge that is enclosed by the body. so if there is no charge inside the body then flux will be zero no matter what is the shape of the body.
47) b) Kirchoff's junction law is based on conservation of charge whereas Kirchhoff's loop law is based on conservation of energy.
48) b) Magnetic force and magnetic field are perpendicular to each other. whereas electric force and electric field act in the same direction.
49) a) constantan and manganin both have a low-temperature coefficient.