Q.

A closed coil having 20 turns, area of cross-section 1 cm2 and  negligible resistance are connected to a ballistic galvanometer of resistance 30 ohms. If the normal of the coil is inclined at 60o to the direction of a magnetic field of intensity 1.5 Wb/m2, the coil is quickly pulled out of the field to a region of zero magnetic field, the charge (in μC) passed through the galvanometer is ______.

see full answer

Talk to JEE/NEET 2025 Toppers - Learn What Actually Works!

Real Strategies. Real People. Real Success Stories - Just 1 call away
An Intiative by Sri Chaitanya

answer is 50.

(Unlock A.I Detailed Solution for FREE)

Ready to Test Your Skills?

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

Take Free Test

Detailed Solution

The total flux linked with the coil having turns N and area A isϕinitial =N(B→⋅A→)=NBAcos⁡θ=NBAcos⁡60∘=NBA2When the coil is pulled out, the flux becomes zero ϕfinal =0 The change in flux is Δϕ=NBA2−0Hence the charge flowed through the circuit isq=ΔϕR=NBA2R=20×1.5×10−42×30=5.0×10−5C=50.0μC
Watch 3-min video & get full concept clarity
score_test_img

Get Expert Academic Guidance – Connect with a Counselor Today!

whats app icon
A closed coil having 20 turns, area of cross-section 1 cm2 and  negligible resistance are connected to a ballistic galvanometer of resistance 30 ohms. If the normal of the coil is inclined at 60o to the direction of a magnetic field of intensity 1.5 Wb/m2, the coil is quickly pulled out of the field to a region of zero magnetic field, the charge (in μC) passed through the galvanometer is ______.