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

increase by about `9%`

increase by about `11%`

increase by about `19%`

decrease by about `10%`

Text Solution

Verified by Experts

The correct Answer is:

Topper's Solved these Questions

CIRCULAR,ROTATIONAL & SIMPLE HARMONIC MOTION
D MUKHERJEE|Exercise All Questions|88 Videos
ELECTROMAGNETISM
D MUKHERJEE|Exercise All Questions|91 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.

D MUKHERJEE-ELECTRIC CURRENT IN CONDUCTORS-All Questions

When a 500-W electric and a 500-W heater operate at their rates voltag...
Text Solution
|
A 100W bulb and a 25W bulb are desigened for the same voltage. They ha...
Text Solution
|
If the length of the filament of a heater is reduced by 10%, the power...
Text Solution
|
An ideal cell is connected to a capacitor through a voltmeter. The rea...
Text Solution
|
In the circuit shown in fig. when the switch is closed, the capacitor ...
Text Solution
|
A capacitor is charged and then made to discharged through a resistan...
Text Solution
|
A capacitor charges from a cell through a resistance. The time constan...
Text Solution
|
A capacitor of capacitance C has charge Q. it is connected to an ident...
Text Solution
|
The charge on a capacitor decrease eta time in time t, when it dischar...
Text Solution
|
A straight conductor AB lies along the axis of a hollow metal cylinder...
Text Solution
|
A beam of electorn emitted from the electron gun G is accelerated by ...
Text Solution
|
The charge flowing in a conductor varies with times as Q = at - bt^2. ...
Text Solution
|
The charge flowing in a conductor varies time as, q=at - 1/2 bt^(2) ...
Text Solution
|
When some potential differece is maintained between A and B, current I...
Text Solution
|
In the circuit shown above, each of the four conductors is of resistan...
Text Solution
|
In the circuit shown above, A(1) and A(2) are ammeters of resistance 5...
Text Solution
|
Six identical wires of resistance R each are joined to form a pyramid,...
Text Solution
|
When the switch K is open, the equivalent resistance between A and B i...
Text Solution
|
In the circuit shown in fig. the cell has emf 10V and internal resista...
Text Solution
|
In the circuit shown in fig. some potential difference is applied betw...
Text Solution
|