A bar magnetof lengtdiv0 cm and pole strength 20 A-m is deflected through30 degrees from the magnetic meridian.If earth's horizontal component of field is 320/4pie A/m.The moment of the deflecting couple is
A bar magnetof lengtdiv0 cm and pole strength 20 A-m is deflected through30 degrees from the magnetic meridian.If earth's horizontal component of field is 320/4pie A/m.The moment of the deflecting couple is