When a motor car is started, its light becomes dim because of

Motor cars are coated with ......

When a moist bread is kept exposed in air, it becomes mouldy and black because

When a wire is stretched and its radius becomes r//2 then its resistance will be

Plants bend towards light because

Wave nature of light follows because

A: When an electric motor is started, a variable resistance (that decreases with time) is used in series. This resistance is known as motor slarter, R: The back-emf in the beginning, when motor starts, is very small.

When high power heater is used at homes all bulbs being used become dim. Why?

Assertlon (A). When an electric motor is started the Initial current In It Is considerably more than the final current Reasoning : The current falls due to the fall In the back emf

A simple electric motor has an armature resistance of 1Omega and runs from a dc source of 12 volt . When running unloaded it draws a current of 2 amp . When a certain load is connected , its speed becomes one-half of its unloaded value . The new value of current drawn

A space craft flying in a straight course with a velocity of 75 km s^(-1) fires its rocket motors for 6.0 s. At the end of this time, its speed is 120 km s^(-1) in the same direction. Find : (i) the space craft's average acceleration while the motors were firing, (ii) the distance travelled by the space craft in the first 10 s after the rocket motors were started, the motors having been in action for only 6-0 s.