NEET Physics Current Electricity Questions Solved

NEET - 2013

The resistances of the four arms P, Q,R and S in a Wheatstone's bridge are 10Ω ,30Ω ,30Ω and 90Ω, respectively. The emf and internal resistance of the cell are 7 V and 5 Ω respectively. If the galvanometer resistance is 50Ω, the current drawn from the cell will be

(a) 1.0A

(b) 0.2A

(c) 0.1A

(d) 2.0A



(b) Effective resistance,

Reff=40x120/120+40=4800/160=30Ω

∴ Current I=7/(30+5)=7/35=0.2A

[∴ I=E/R+r]

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