A wire of resistance 10 ohms is drawn out to three times its
original length. The new resistance will be
(1) 90 ohm
(2) 10 ohm
(3) 30 ohm
(4) 120 ohm
- 6 Answers
- 12637 Views
- I also Faced
- E-Mail Answers
Answers were Sorted based on User's Feedback
Answer / harsh dubey
R=RHO*L/A
MULTIPLY AND DIVIDE BY L
R=RHO*L*L/A*L
AS RHO AND VOLUME(A*L)IS CONSTT.
SO
WE HAVE,
R2/R1=square of (L2/L1)
as increased by 3 times,putting L1=3L2
WE HAVE,
R2=9R1
OR
R2=square of (n)*r........
so correct answer is=90ohm
| Is This Answer Correct ? | 8 Yes | 2 No |
Answer / shwta
thnx a lot, mr harsh dubey! ur answer helped me a lot..
thanx again!! *gratitude*
| Is This Answer Correct ? | 0 Yes | 1 No |
Answer / p dilip kumar
As R= (SYMBOL ROW * L)/A
which means R is directly propotional to length
so when length of the wire is drawn three times obviously
the resistance will be multiple of 3.
Solution: 30 ohms
| Is This Answer Correct ? | 2 Yes | 9 No |
Trade by smuggling is the overseas transportation of goods and commodities without paying (a) More commodity tax (b) Tax (c) Export octroi (d) None of these
A longitudinal wave is made, when (1) Two stationary waves equal frequency and amplitude meet in opposite directions (2) Two stationary waves of equal frequency and amplitude meet in the same direction (3) Two stationary waves of equal frequency but different amplitudes meet in opposite directions (4) Two stationary waves of equal amplitude but different frequency meet in opposite directions
A transformer transform - a.voltage b.current c.power
A man starts his journey from the North Pole and travels a distance of 100 kms. in one direction. Thereafter, he turns towards east and travels another 100 kms. then he turns northward and goes for another 100 kmz. How far he is now from the North Pole ? (a) 0 km (b) 100 km (c) 200 km (d) 400 km
The critical mass of a nuclear reaction is (1) The initial mass to start a nuclear fission (2) The minimum mass for the chain reaction (3) The size of the reactor core (4) The size of the reactor core + size of the moderator
Three resistances of 2 ohms each are connected in a triangle. The resistance in ohms between any two corners is ?????.. ohms. (1) 3 (2) 4 (3) 6 (4) 4/3
Gokak Falls is situated in which district ? (1) Dharwad (2) Raichur (3) Belagavi (4) Bidar
RRB KAPURTHALA NEW JOINING 2012
pls tell me when the notification is released
When will be the next RRB exam held
Railway Recruitment Board (Chandigarh) Goods Guard Recruitment Exam May 2004 Question Paper
2 Answers AGG, EEE, Manufacturing, Maruti Udyog, PSC, RRB,
Insulation value of conductors with reference to earth is mentioned in (a) Ampere (b) Resistance (c) Voltage (d) Wattage
UPSC 
