(a) When placed in a magnetic field, ferrous materials become magnetized, intens

Question

(a) When placed in a magnetic field, ferrous materials become magnetized, intensifying the magnetic field. What effect would placing a ferrous bar in the primary coills have on the magnetic flux in the secondary coil?

(b) An oscilloscope probe is used to measure the voltage accross a resistor. Why is this related to the current in the circuit?

(c) What does Vb/Va tell me when the oscilloscope probe A measures the total voltage while probe B measures only voltage across the resistor?

(d) What does a galvanometer measure and in what units does the galvonometer measure it in?

Explanation / Answer

a)When a ferrous bar is placed in the primary coil, it will work as a transformer core. Along with intensifying the magnetic field, it will reduce the eddy current loss. Thus, it will increase the efficiency of a transformer

b) Basically the oscilloscope input front-end has its own internal capacitance and its own internal resistance. In order to prevent signal distortion, the capacitance of the probe needs to match the capacitance of the scope. If it isn't well matched, you'll get overshooting or undershooting. Most scopes have on their front a probe compensation connector which provides test signal that can be used to tune the capacitance of the probe

c) It tells about the extent of voltage drop across the resistor. We can guess about other applieances like capacitor and inductor in the circuit.

d) A galvanometer measures current. Unit - Ampere

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