## Two conductors A and B of resistances 5 Ω and 10 Ω respectively are first joined in parallel and then in series. In each case the voltage applied is 20 V. Answer any four questions from (a) to (e).

## Question 4 (a)

## Draw the circuit diagram to show connection when A and B are joined in parallel?

**
Answer:
**

**
Circuit (i)
**
is the correct circuit diagram.

## Question 4 (b)

## In which combination will the voltage across the conductors A and B be the same?

## (i) Series arrangement

## (ii) Parallel arrangement

## (iii) Both of the above

## (iv) None of the above

**
Answer:
**

In
**
parallel circuits
**
, the
**
potential difference across each resistor
**
is the
**
same.
**

So, the
**
correct answer is (ii)
**

## Question 4 (c)

## In which arrangement will the current through A and B be the same?

## (i) Series arrangement

## (ii) Parallel arrangement

## (iii) Both of the above

## (iv) None of the above

**
Answer:
**

In
**
series circuits
**
, the
**
current across each resistor
**
is the
**
same.
**

So, the
**
correct answer is (i)
**

## Question 4 (d)

## Equivalent resistance in parallel combination is:

## (i) 15 Ω

## (ii) 3.33 Ω

## (iii) 0.3 Ω

## (iv) None of the above

**
Answer:
**

Let R be the equivalent resistance in the parallel combination.

1 / R = 1 / 5 + 1 / 10

= (2 + 1) / 10

= 3 / 10

Therefore,
**
R =
**
10/3
**
= 3.333 ohm
**

So, the
**
correct answer is (ii)
**

## Question 4 (e)

## Equivalent resistance in series combination is:

## (i) 15 Ω

## (ii) 3.33 Ω

## (iii) 0.3 Ω

## (iv) None of the above

**
Answer:
**

Let R be the equivalent resistance in the series combination.

**
R
**
= 5 + 10

**
= 15 ohm
**

So, the
**
correct answer is (i)
**