Question

In the circuit show in figure, after closing the switch S, match the following two columns.

Column I	Column II
(a) Current through R1	(p) Will increase
(b) Current through R2	(q) Will decrease
(c) Potential difference across R1	(r) Will remain same
(d) Potential difference across R2	(s)Date insufficient

(A) a – p, b – q, c – r, d – s 

(B) a – p, b – r, c – s, d – q 

(C) a – p, b – r, c – s, d – q 

(D) a – q, b – p, c – q, d – p

Answer 1

The correct option (D) a – q, b – p, c – q, d – p

Explanation:

When switch is close, some current now move through R₃ hence current through R₁ will decrease and potential difference across R₁ will decrease. 

Also effective current through R₂ will increases because of presence of R₃ in parallel to R₁. As in parallel connection, resistance decreases, hence current will increase. 

∴ current through R₂ will increase potential difference R₂ will also increase.

∴ a → q 

c → q 

b → p 

d → p.