AP EAMCET · PHYSICS · Magnetic Properties of Matter
A short bar magnet placed in a horizontal plane has its axis aligned along north-south direction. Null points are found on the axis of the magnet at \(20 \mathrm{~cm}\) from the centre of magnet. The earth's magnetic field at the place is \(B\) and angle of dip is \(0^{\circ}\). If the total magnetic field on the normal bisector of the magnet \(20 \mathrm{~cm}\) from the centre of the magnet is \(0.6 \mathrm{G}\), then the magnitude of \(B\) is.
- A \(0.2 \mathrm{G}\)
- B \(0.4 \mathrm{G}\)
- C \(1.2 \mathrm{G}\)
- D \(0.3 \mathrm{G}\)
Answer & Solution
Correct Answer
(B) \(0.4 \mathrm{G}\)
Step-by-step Solution
Detailed explanation
At null point (and along the axis), earth's magnetic field and bar's magnetic field are opposite in direction. On equitorial line, bar's mågnetic field is opposite in idirection to its field on the axis. Hence, on equatorial line, the two fields add up As null points are on the…
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