Figure shows a coil C connected to a galvanometer G. When the North-pole of a bar magnet is pushed towards the coil, the pointer in the galvanometer deflects. Regarding this set up, the following statements are given:
(A) It indicates the presence of electric current in the coil.
(B) The deflection is found to be smaller when the magnet is pushed towards the coil faster.
(C) There is repulsion in the moving magnet and the magnetic pole induced in the coil facing towards the N pole of the magnet.
(D) If the bar magnet does not move, there is no induced current in the coil.
Choose the correct answer from the options given below:
To solve this question, we need to understand the principles of electromagnetic induction as described by Faraday's Law.
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Statement (A): "It indicates the presence of electric current in the coil."
This statement is true. According to Faraday’s Law, when the magnet is moved towards the coil, it induces an electromotive force (EMF) in the coil, resulting in a current, which is detected as a deflection in the galvanometer.
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Statement (B): "The deflection is found to be smaller when the magnet is pushed towards the coil faster."
This statement is false. A faster change in the magnetic field (faster movement of the magnet) induces a greater EMF, resulting in greater deflection, not smaller.
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Statement (C): "There is repulsion in the moving magnet and the magnetic pole induced in the coil facing towards the N pole of the magnet."
This statement is true. Lenz’s Law states that the direction of induced current is such that it opposes the change in magnetic field, causing a repulsive interaction.
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Statement (D): "If the bar magnet does not move, there is no induced current in the coil."
This statement is true. No movement implies no change in magnetic flux, so no EMF or current is induced.
The correct answer is therefore the option including statements (A), (C), and (D) only.
Important Questions from Electromagnetic Induction
The half-life period of a radioactive element 'X' is same as the mean life of another radioactive element Y. Initially both of them have the same no. of atoms, then:
A. X and Y have the same decay rate initially.
B. X and Y decay at the same rate always.
C. Y will decay at a faster rate than X.
D. X will decay at a faster rate than Y.
Choose the correct answer from the options given below:
The wire loop PQRSP formed by joining two semicircular wires of radii R1 & R2 carries a current I as shown in the figure. The magnitude of the magnetic field at the centre 'C' is:
A Neutron is moving with a velocity of V in a non-uniform magnetic field as shown in the figure.
Velocity v̅ of neutron would be:
The graph between resistivity and temperature given below can be for the material:
Which phenomenon proves the particle nature of photons?
