SaraNextGen Study App [2022-23]
Last Updated On 23-10-2022 - By Sara

Two equal resistances when connected in series to a battery, consume electric power of 60 W. If these resistances are now connected in parallel combination to the same battery, the electric power consumed will be :

(a)

60 W

(b)

240 W

(c)

30 W

(d)

120 W


Question ID - 50314 :-

Two equal resistances when connected in series to a battery, consume electric power of 60 W. If these resistances are now connected in parallel combination to the same battery, the electric power consumed will be :

(a)

60 W

(b)

240 W

(c)

30 W

(d)

120 W

1 Answer
5876 Votes
3537

Answer Key : (b) -

In series condition, equivalent resistance is 2R

Thus power consumed is 60W=

In parallel condition, equivalent resistance is R/ 2 thus new power is

P’=

Or P’= 4p = 240 W



Next Question :

An object is at a distance of 20m from a convex lens of focal length 0.3 m. The lens forms an image of the object. If the object moves away from the lens at a speed of 5 m/s, the speed and direction of the image will be :

(a)

0.92×10−3 m/s away from the lens

(b)

2.26×10−3 m/s away from the lens

(c)

1.16×10−3 m/s towards the lens

(d)

3.22×10−3 m/s towards the lens


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