SATHEE: Electromagnetic Induction and Alternating Current 1 Question 4

Electromagnetic Induction and Alternating Current 1 Question 4

4. In a coil of resistance $100 Ω$ , a current is induced by changing the magnetic flux through it as shown in the figure. The magnitude of change in flux through the coil is (2017 Main)

(a) $225 W b$

(b) $250 W b$

(d) $200 W b$

Show Answer

Answer:

Correct Answer: 4. (b)

Solution:

Induced constant, $I = \frac{e}{R}$

Here, $e =$ induced emf $= \frac{d φ}{d t}$

$\begin{aligned} I & = \frac{1}{R} = \frac{d φ}{d t} \cdot \frac{1}{R} \\ d φ & = I R d t \\ φ & = \int I R d t \end{aligned}$

$∴$ Here, $R$ is constant

$∴ φ = R \int I d t$

$\begin{aligned} \int I \cdot d t = Area under I - t graph \\ = \frac{1}{2} \times 10 \times 0.5 = 2.5 \\ ∴ φ = R \times 2.5 = 100 \times 2.5 = 250 Wb . . \end{aligned}$

Electromagnetic Induction and Alternating Current 1 Question 4

4. In a coil of resistance $100 Ω$ , a current is induced by changing the magnetic flux through it as shown in the figure. The magnitude of change in flux through the coil is (2017 Main)

Answer:

Engineering Preparation

Medical Preparation

NCERT Books & Solutions

Important Resources

Other Resources

Syllabus

Test Platform

Sample Mock Test

Mentorship

NCERT Exercise Video Solution

Electromagnetic Induction and Alternating Current 1 Question 4

4. In a coil of resistance 100Ω, a current is induced by changing the magnetic flux through it as shown in the figure. The magnitude of change in flux through the coil is (2017 Main)

Answer:

Engineering Preparation

Medical Preparation

NCERT Books & Solutions

Important Resources

Other Resources

Syllabus

Test Platform

Sample Mock Test

Mentorship

NCERT Exercise Video Solution

Menu

4. In a coil of resistance $100 Ω$ , a current is induced by changing the magnetic flux through it as shown in the figure. The magnitude of change in flux through the coil is (2017 Main)