A straight conductor passes horizontally through point from West to East carrying a…

PHYSICS · Multi-part · CBSE · Physics · Magnetic Effects of Electric Current · Magnetic Effects of Electric Current

Problem

A straight conductor passes horizontally through point

O

from West to East carrying a current of

10\,\text{A}

. (i) A magnetic compass is placed

4\,\text{cm}

directly above the wire at point

A

. Which pole of the compass needle will point towards the wire? Explain your answer. (ii) Another identical compass is placed

4\,\text{cm}

directly below the wire at point

B

. Predict the deflection of its needle and justify your prediction. (iii) Without changing the positions of the compasses, the current in the wire is increased to

20\,\text{A}

. Describe the change, if any, in the magnitude and the direction of the magnetic field at points

A

and

B

. Give reasons.

Related theory

Fields due to Currents
Right-Hand Thumb Rule
Magnetic field due to a current
Magnetic effect of current
Magnetic Effects of Electric Current

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