) A fuse wire is a safety device to protect the electric circuit. Ashok used a fuse rated as 5 A in a circuit in which an electric heater of 2 kW was connected with the main supply of 220 V. The heater was not operating as the fuse wire melted on switching. Ashok was puzzled and he discussed the problem with his friend Ram. Ram suggested him to use a fuse rated 10 A in the circuit. The problem of Ashok was solved as the heater was now working. (i) Fuse wire has higher resistance or lower resistance? (ii) How much current was flowing in the circuit with the fuse rated 10 A
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Numerical for practice:
2. A wire 10 cm long and carrying a current of 1.5 A is held in a uniform magnetic field in which B=10-3 T. Calculate the force on the wire if it is held perpendicular to the lines of the magnetic field. ... A current of 10 A flows in a circular coil of 1000 turns and radius 0.1 m.
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