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Q.31
(i) State the law that explains the heating effect of current with respect to the measurable properties in an electrical circuit. (ii) List the factors on which the resistance of a conductor depends.
Anannya responded to the question: Why do electrical appliances with metallic bodies are connected to the mains through a three pin plug, whereas an electric bulb can be connected with a two pin plug? She wrote: Three pin connections reduce heating of connecting wires. (i) Is her answer correct or incorrect? Justify. (ii) What is the function of a fuse in a domestic circuit?
Q.34
Q.34
A doctor has advised Sameer to reduce sugar intake in his diet and do regular exercise after checking his blood test reports.
Given below are certain situations. Analyze and describe its possible impact on a person:
The above image shows a thin lens of focal length 5m.
A 10 cm long pencil is placed 5 cm in front of a concave mirror having a radius of curvature of 40 cm.
The above image shows a thin lens of focal length 5m.