AI Mentor

Check Your IQ

Free Expert Demo

Try Test

Courses

Dropper NEET Course Dropper JEE Course Class - 12 NEET Course Class - 12 JEE Course Class - 11 NEET Course Class - 11 JEE Course Class - 10 Foundation NEET Course Class - 10 Foundation JEE Course Class - 10 CBSE Course Class - 9 Foundation NEET Course Class - 9 Foundation JEE Course Class -9 CBSE Course Class - 8 CBSE Course Class - 7 CBSE Course Class - 6 CBSE Course

Offline Centres

The magnetic flux density B is changing in magnitude at a constant rate dB/dt. A given mass m of copper, drawn into a wire of radius a and formed into a circular loop of radius r is placed perpendicular to the field B. The induced current in the loop is i. The resistivity of copper is $ρ$ and density is d. The value of the induced current i is

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

$\frac{m}{4 π a^{2} r} \frac{d B}{d t}$

$\frac{m}{4 π a d} \frac{d B}{d t}$

$\frac{m}{2 π ρ d} \frac{d B}{d t}$

$\frac{m}{4 π ρ d} \frac{d B}{d t}$

answer is D.

(Unlock A.I Detailed Solution for FREE)

Best Courses for You

JEE

NEET

Foundation JEE

Foundation NEET

CBSE

Detailed Solution

$e = \frac{d ϕ}{d t} \Rightarrow i = \frac{e}{R} = \frac{1}{R} \frac{d}{d t} (B A) = \frac{A}{R} \frac{d B}{d t}$

where $π r^{2} =$ area of the loop of radius r and R = resistance of the loop of length $(2 π r)$ and area of cross section $π a^{2}$ .

$R = \frac{ρ l}{π a^{2}} = \frac{ρ (2 π r)}{π a^{2}}$

Further mass of wire is $m = (π a^{2}) (2 π r) (d)$

$i = \frac{(π a^{2}) (π r^{2})}{ρ (2 π r)} \frac{d B}{d t}$

$i = \frac{(π a^{2}) (2 π r)}{4 π ρ} \frac{d B}{d t} \Rightarrow i = \frac{m}{4 π ρ d} \frac{d B}{d t}$

Watch 3-min video & get full concept clarity

courses

No courses found

Result Producing online coaching for JEE/NEET of south India

Largest All India Test Series for JEE/NEET

Best Online Course for IIT JEE

Best Online Course for NEET

Best Online Course for CBSE

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!