(a) Sketch the form of the magnetic flux pattern due to a current flowing (i) in a long solenoid (ii) through two long straight parallel wires when the dire...

(a) Sketch the form of the magnetic flux pattern due to a current flowing

(i) in a long solenoid

(ii) through two long straight parallel wires when the directions of the current are opposite. (Neglect the earth's magnetic field).

(b) Draw a labelled diagram of an electric bell and explain how it works

(c) An electric bell takes a current of 0.2A groin a battery of two dry cells connected in series. Each cell has an e.m.f. of 1.5V and an internal resistance of 1.0\(\Omega\).

(i) Calculate the effective resistance of the bell

(ii) What current would the bells take in the cells were arranged in parallel?