NEET Questions Solved


A rectangular loop with a sliding connector of length l = 1.0 m is situated in a uniform magnetic field B = 2T perpendicular to the plane of loop. Resistance of connector is r = 2Ω. Two resistance of 6Ω and 3Ω are connected as shown in figure. The external force required to keep the connector moving with a constant velocity v = 2m/s is

(1) 6 N

(2) 4 N

(3) 2 N

(4) 1 N

Concept Videos :-

#6 | Motional EMF (Induced Electric Field)
#7 | Problem Set1: Motional EM
#8 | Problem Set2: Motional EM
#9 | Problem Set3: Motional EMF
#10 | Problem Set4: Motional EMF
#11 | Equivalent Circuit Diagrams

Concept Questions :-

Motional emf

(3) Motional emf e=Bvle=2×2×1=4V

This acts as a cell of emf E = 4V and internal resistance r = 2Ω.

This simple circuit can be drawn as follows

Current through the connector i=42+2=1A

∴ magnetic force on connector Fm=Bil=2×1×1=2N  (Towards left)

Difficulty Level:

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