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Answer:
Similarly, if magnet is held stationary and the coil is moved away and towards the magnet, the galvanometer shows deflection in similar manner. It is also seen that, the faster the change in the magnetic field, the greater will be the induced emf or voltage in the coil.
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With increase in magnetic field, the deflection in magnetic field increases.
We have a galvanometer placed in a magnetic field.
We have to determine the relationship between strength of the magnetic field and the deflection of the galvanometer needle.
What is Magnetic field ?
The area around the magnet in which the magnetic force of attraction or repulsion exists is called magnetic field.
According to the question -
A galvanometer needle is kept in magnetic field. According to the faraday's law, the rate of change of flux is proportional to induced emf as-
E = - n dΦ/dt
Now, greater the rate at which the flux changes, greater will be the emf induced. Now, from Ohm's law, the current flow in the coil is directly proportional to induced emf. The deflection in galvanometer needle is directly proportional to current flowing in the coil. Hence, the galvanometer needle deflects.
Hence, with increase in magnetic field, the deflection in magnetic field increases.
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