Question

A square loop is placed near a long straight current carrying wire as shown. Match the following two columns.



$\begin{array}{cc}\text{Column-I}& \text{Column-II}\\ \text{(a) If current increased}& \text{(p) induced current in loop is clockwise}\\ \text{(b) If current is decreased}& \text{(q) induced current in loop is anticlockwise}\\ \text{(c) If loop is moved away from the wire}& \text{(r) wire will attract the loop}\\ \text{(d) If loop is moved towards the wire}& \text{(s) wire will repel the loop}\end{array}$

• A. $\text{a}\to \text{p,r};\text{b}\to \text{q,s};\text{c}\to \text{q,s};\text{d}\to \text{p,r}$
• B. $\text{a}\to \text{p,s};\text{b}\to \text{q,s};\text{c}\to \text{p,s};\text{d}\to \text{p,r}$
• C. $\text{a}\to \text{p,r};\text{b}\to \text{q,s};\text{c}\to \text{p,s};\text{d}\to \text{p,r}$
• D. $\text{a}\to \text{p,s};\text{b}\to \text{q,r};\text{c}\to \text{p,s};\text{d}\to \text{p,s}$

Answer 1

The correct option is A $\text{a}\to \text{p,r};\text{b}\to \text{q,s};\text{c}\to \text{q,s};\text{d}\to \text{p,r}$

Case-1: If current is increased.

$⨂$ magnetic field passing through loop will increase. So induced current will produce $⨀$ magnetic field.

Hence induced current is anti-clockwise.

Case-2: If current is decreased.

$⨂$ magnetic field passing through loop will decrease. So induced current will produce $⨀$ magnetic field.

Hence induced current is clockwise.

Case-3: When the loop is moved away from the wire

Magnetic flux passing through the loop decreases, therefore an induced current appears in the loop to counter rate of change of flux.

So, current in the loop will be clockwise.

Loop gets attracted towards the wire.

Case-3: When the loop is moved towarsds the wire

Magnetic flux passing through the loop decreases, therefore an induced current appears in the loop to counter rate of change of flux.

So, current in the loop will be anti- clockwise.

Loop gets repelled away from the wire.