Banner 0
Banner 1
Banner 2
Banner 3
Banner 4
Banner 5
Banner 6
Banner 7
Banner 8
Banner 9

Q.

Given below are two statements :
Statement-I : The equivalent emf of two non-ideal batteries connected in parallel is smaller than either of the two emfs.
Statement-II : The equivalent internal resistance of two non-ideal batteries connected in parallel is smaller than the internal resistance of either of the two batteries. 

In the light of the above statements, choose the correct answer from the options given below.

see full answer

Your Exam Success, Personally Taken Care Of

1:1 expert mentors customize learning to your strength and weaknesses – so you score higher in school , IIT JEE and NEET entrance exams.
An Intiative by Sri Chaitanya

a

Both Statement-I and Statement-II are true

b

Statement-I is true but Statement-II is false

c

 Both Statement-I and Statement-II are false

d

Statement-I is false but Statement-II is true

answer is D.

(Unlock A.I Detailed Solution for FREE)

Best Courses for You

JEE

JEE

NEET

NEET

Foundation JEE

Foundation JEE

Foundation NEET

Foundation NEET

CBSE

CBSE

Detailed Solution

To analyze the correctness of the statements, let's consider two non-ideal batteries connected in parallel. Each battery has an emf (E1,E2E_1, E_2) and an internal resistance (r1,r2r_1, r_2).

Step 1: Equivalent EMF for Parallel Batteries

For two batteries with different emfs and internal resistances, the equivalent emf (EeqE_{\text{eq}}) is given by:

Eeq=E1/r1+E2/r21/r1+1/r2E_{\text{eq}} = \frac{E_1/r_1 + E_2/r_2}{1/r_1 + 1/r_2}

Since this equation is a weighted average of E1E_1 and E2E_2, the equivalent emf lies between E1E_1 and E2E_2. This means:

Eeq is smaller than the larger emf and greater than the smaller emf.E_{\text{eq}} \text{ is smaller than the larger emf and greater than the smaller emf.}

Thus, Statement-I is incorrect because it claims that EeqE_{\text{eq}} is smaller than either E1E_1 or E2E_2, which is not true.

Step 2: Equivalent Internal Resistance for Parallel Batteries

The equivalent internal resistance (reqr_{\text{eq}}) for two internal resistances in parallel is:

1req=1r1+1r2\frac{1}{r_{\text{eq}}} = \frac{1}{r_1} + \frac{1}{r_2}

Since the parallel combination of resistances always results in a smaller equivalent resistance than either of the individual resistances, we conclude:

req<r1 and req<r2r_{\text{eq}} < r_1 \quad \text{and} \quad r_{\text{eq}} < r_2

Thus, Statement-II is correct.

Watch 3-min video & get full concept clarity
score_test_img

courses

No courses found

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test

Get Expert Academic Guidance – Connect with a Counselor Today!

best study material, now at your finger tips!

  • promsvg

    live classes

  • promsvg

    progress tracking

  • promsvg

    24x7 mentored guidance

  • promsvg

    study plan analysis

download the app

gplay
mentor

Download the App

gplay
whats app icon
personalised 1:1 online tutoring