Investigation of magnetic fields by search coil

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AL Practical Physics

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C15 Investigation of magnetic fields by search coil

Procedure

A. Magnetic field around straight wire

4. Switch off the time base of the CRO. Record the length of the vertical trace shown on the CRO, which represents the induced peak-to-peak e.m.f. (V) in the search coil and also the magnetic field around the straight wire.

5. Repeat steps 2 to 4 with the other values of currents (I) from the signal generator in steps of 0.1 A. Tabulate the results.

Current (I) / A

0.5

0.6

0.7

0.8

0.9

.0

Induced e.m.f. (V) / mV

3.0

6.0

8.5

21.0

23.0

26.0

6. Plot a graph of the induced e.m.f. (V) against the current (I).

7. Repeat steps 2 to 4 with the other values of distances (r) of the search coil away from the straight wire. Tabulate the results.

Distance (r) / cm

2

3

4

5

6

/r / cm?1

.00

0.50

0.33

0.25

0.20

0.17

Induced e.m.f. (V) / mV

3.0

7.0

5.0

4.0

3.5

3.0

8. Plot a graph of the induced e.m.f. (V) against the reciprocal of distance ().

9. Vary the frequency of the signal generator. Describe how the sensitivity of the search coil changes.
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The rate of magnetic flux is increased and hence the sensitivity of the search coil.

B. Magnetic field around slinky solenoid

2. Place the search coil at the centre of the solenoid. Make sure the search coil is perpendicular to the solenoid. Describe the variation of induced e.m.f. shown on the CRO.

The induced e.m.f. or the magnetic field is uniform across the cross-section of the

solenoid but rapidly drops to zero outside it.

3. Repeat step 12 with placing the search coil at the end of the solenoid, across its cross-section ...

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