This set of Physics Multiple Choice Questions & Answers (MCQs) focuses on “Faraday and Henry Experiments”.
1. What is the instrument used in Faraday’s experiment?
d) Meter Bridge
Explanation: Faraday used a galvanometer and connected it to a coil. A bar magnet was pushed towards the coil, such that the north-pole is pointing towards the coil. As the bar magnet is shifted, the pointer in the galvanometer gets deflected, thus indicating the presence of current in the coil.
2. Which among the following affects the deflection in the galvanometer?
a) Area of the coil
b) Current passing through the coil
c) Speed with which the bar magnet is pulled towards or away from the coil
d) Resistance offered for current flow
Explanation: The deflection of the pointer is larger or smaller depending upon the speed with which the bar magnet is pulled towards or away from the coil. Moreover, the direction of deflection of the pointer depends upon the direction of motion of the bar magnet.
3. In the second experiment, Faraday replaced ‘X’ with ‘Y’ for checking the deflection in the galvanometer. Identify X and Y.
a) X ➔ Current carrying coil; Y ➔ Bar magnet
b) X ➔ Bar magnet; Y ➔ Current carrying coil
c) X ➔ Bar magnet; Y ➔ Battery
d) X ➔ Current carrying coil; Y ➔ Battery
Explanation: In the second experiment, Faraday replaced the bar magnet by a second current carrying coil that was connected to a battery. As we move the second coil towards the primary coil, the pointer in the galvanometer undergoes deflection, which indicates the presence of the electric current in the first coil.
4. The galvanometer shows deflection even when the bar magnet is stationary.
Explanation: No, this statement is false. When the bar magnet is stationary, the pointer shows no deflection and the motion lasts only till the magnet is in motion. This shows that only the relative motion between the magnet and the coil is responsible for the generation of current in the coil.
5. Find the true statement.
a) The relative motion between the coils was not compulsory for the current in the primary to be generated
b) The direction of deflection of the pointer does not depend upon the direction of motion of the secondary coil towards or away from the primary coil in the second experiment
c) When the south-pole of the bar magnet is moved towards or away from the coil, the deflections in the galvanometer are same to that observed with the north-pole for similar movements
d) There is a difference in effect when the bar magnet is kept stationary and the coil is in motion
Explanation: The relative motion between the coils was not really necessary for the current in the primary to be generated. In the third experiment, Faraday placed two stationary coils and connected one of them to the galvanometer and the other to a battery, through a push button. As the button was pressed, the galvanometer in the other coil showed a deflection, indicating the presence of current in that coil. All the other statements are not valid.
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