Home
Class 12
PHYSICS
If the length of the filament of a heate...

If the length of the filament of a heater is reduced by `10%`, the power of the heater will

A

increase by about `9%`

B

increase by about `11%`

C

increase by about `19%`

D

decrease by about `10%`

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • CURRENT ELECTRICITY

    MOTION|Exercise EXERCISE - 1 (SECTION F- Electrical Instrument + Exp. Verifying ohm s law & Specific Resistance Using Meter Brige & Post Office + Potentiomenter (EMF & Int . Res.)|11 Videos
  • CURRENT ELECTRICITY

    MOTION|Exercise EXERCISE -2 (Level -I) SECTION A- Definition of Current , Current Density , Drift Velocity|6 Videos
  • CURRENT ELECTRICITY

    MOTION|Exercise EXERCISE - 1 SECTION C,D - Circuit theory, KCL & KVL, Battery , Grouping of cells|15 Videos
  • CONSTRAINED MOTION

    MOTION|Exercise EXAMPLES|12 Videos
  • ELASTICITY

    MOTION|Exercise EXERCISE -3|60 Videos

Similar Questions

Explore conceptually related problems

If the length of the filament ofa heater is reduced by 10% the power of the heater will :

The element of a heater is

The coil in a heater is made of

The length of one pair of opposite sides of a square is reduced by 10% and that of the other pair is increased by 10%. Compare the area of the new rectangle with the area of the original square.

If the coil of a heater is cut to raduce its length by 20% then effect on its power will be

If the current in a heater increases by 10% the percentage change in the power consuption

When a 500-W electric and a 500-W heater operate at their rates voltages, the filament of the bulb reaches a much higher temperature than the filament of the heater. The most important reason for this that

A metal block of heat capacity 80J^(@)C^(-1) placed in a room at 20^(@)C Is heated electrically. The heater is swiched off when the temperature reaches 30^(@)C . The temperature of the block rises at the rate of 2^(@)Cs^(-1) just after the heater is switched on the and falls at the rate of 0.2^(@)Cs^(-1) just after the heater is switched off. Assume newtons law of cooling to hold. (a) Find the power of the heater. (b) Find the power radiated by the block just after the heater is switched off. (c) Find the power radiated by the block when the temperature of the block is 25^(@)C . (d) Assuming that the power radiated at 25^(@)C represents the average value in the heating process, find the time for which the heater was kept on.