We Know that sum of the n natural numbers =n(n+1)2

Then sum of 50 natural numbers= 50(51)2= 1250

Average of the 50 natural numbers = 125050 = 25.5

D.C series motor both armature and feild connected in series at noload condition current drawn by the motor is zero Ia=0 flux also zero. but very small amount of flux avalible because of residual magnetism

in series motor speed  =  N α Eb/Φ Eb almost conistant

                                 =    N α 1/Φ

At no load condition d.c series can be run as dangerously very high so d.c series motor
operated at load condition only

The ancient settlement of Mohenjo-daro is situated in Larkana District in the Sindh province of Pakistan.

The Pedana Kalamkari craft made at Pedana nearby Machilipatnam Andhra Pradesh. Evolved with the patronage of the Mughals and the Golconda sultanate.

The resistivity of wire or the metal conductor is depend on the number density of free electrons in the conductor. so its mainly depends on nature of the material

Junko Tabei is the first woman to climb Mount Everest and she reached the summit of the world's highest peak in 1975