Question
Assertion : Acceleration of a magnet falling through a long solenoid decreases.
Reason : The induced current produced in a circuit always flow in such direction that it opposes the change or the cause the produced it.

Answer

(a) The induced current in the ring opposes the motion of falling magnet. Therefore, the acceleration of the falling magnet will be less than that due to gravity.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

Assertion : Under given conditions of pressure and temperature, sound travels faster in a monoatomic gas than in diatomic gas.
Reason : Opposition for wave to travel is more in diatomic gas than monoatomic gas.
Assertion : A bullet is fired from a rifle. If the rifle recoils freely, the kinetic energy of rifle is more than that of the bullet.
Reason : In the case of rifle bullet system the law of conservation of momentum violates.
Assertion : Thermodynamic process in nature are irreversible.
Reason : Dissipative effects can not be eliminated.
Assertion : Two electric bulbs of 50 and $100 W$ are given. When connected in series $50 W$ bulb glows more but when connected parallel $100 W$ bulb glows more.
Reason : In series combination, power is directly proportional to the resistance of circuit. But in parallel combination, power is inversely proportional to the resistance of the circuit.
Assertion : In the following circuit the potential drop across the resistance is zero.
Image
Reason : The given resistance has low value.
Assertion : A positive acceleration of a body can be associated with a 'slowing down' of the body.
Reason : Acceleration is a vector quantity.
Assertion : If the speed of a body is constant, the body cannot have a path other than a circular or straight line path.
Reason : lt is not possible for a body to have a constant speed in an accelerated motion.
Assertion : If $\vec{A} \cdot \vec{B}=\vec{B} \cdot \vec{C}$, then $\vec{A}$ may not always be equal to $\vec{C}$
Reason : The dot product of two vectors involves cosine of the angle between the two vectors.
Assertion : Interference pattern is made by using blue light instead of red light, the fringes becomes narrower.
Reason : In Young's double slit experiment, fringe width is given by relation $B=\frac{\lambda D}{d}$.
Assertion : The heat supplied to a system is always equal to the increase in its internal energy.
Reason : When a system changes from one thermal equilibrium to another, some heat is absorbed by it.