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======= ####89. A heating coil is labelled $100 W, 220 V$ . The coil is cut in half and the two pieces are joined in parallel to the same source. The energy now liberated per second is

c3eec34ec6b1fad69db54a20ad4b2dca40c2aa54 (a) $25 J$

(b) $50 J$

(d) $400 J$

[1995]

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Answer:

Correct Answer: 89. (d)

Solution:

(d) Power of heating coil $= 100 W$ and voltage (V) $= 220$ volts. When the heating coil is cut into two equal parts and these parts are joined in parallel, then the resistance of the coil is reduced to one-fourth of the previous value. Therefore energy liberated per second becomes 4 times i.e., $4 \times 100 = 400 J$ .

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Current Electricity - Result Question 84

89. A heating coil is labelled 100W,220V. The coil is cut in half and the two pieces are joined in parallel to the same source. The energy now liberated per second is

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Answer:

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89. A heating coil is labelled $100 W, 220 V$ . The coil is cut in half and the two pieces are joined in parallel to the same source. The energy now liberated per second is