Explanation
The work done in turning a magnet of magnetic moment M by an angle of 90o from the meridian is n times the corresponding work done to turn it through an angle of 60o from the meridian, where n is given by :
A magnet of moment 4 Am2 is suspended in a uniform magnetic field of induction 5×10−4 T with its axis at right angles. When the magnet is released from it's position, the kinetic energy that it gains in passing to the stable equilibrium position is :
A magnet of moment 1.2 Am2 is kept suspended in a magnetic field of induction 2×10−6. The work done in rotating it through 120o is:
Assertion: When radius of a circular wire carrying current is doubled, its magnetic moment becomes four times
Reason: Magnetic moment is directly proportional to area of the loop
The magnetic moment of a bar magnet is 0.256 amp.m2. Its pole strength is 400 milli amp. m. It is cut into two equal pieces and these two pieces are arranged at right angles to each other with their unlike poles in contact (or like poles in contact). The resultant magnetic moment of the system is
A magnet is in stable equilibrium in a uniform magnetic field. It is deflected by 60o and the workdone is equal to W. In deflecting the magnet further by 30o, Work done is:
B=μo4πIa(sinϕ1+sinϕ2)
Where angles ϕ1 and ϕ2 are as shown in the figure.
Correct Option is D.
Explanation for the correct answer:
Step 1: Note all the given values.
The magnetic field produced by a current-carrying straing conductor carrying current I at a point P at a distance r from the wire is calculated as follows:
In the given problem, we must calculate the Magnetic Field at a distance of 3m from one end of the wire, which is lying on the wire's axis.
Therefore, ϕ1=0andϕ2=180
Step 2: Calculate Field at given point.
Magnetic Field at a point at distance 3m from one end of the wire lying on the axis of the wire is,
B=μo4πIa(sin0+sin180)
⇒B=μo4πIa(0+0)
⇒B=0
As a result, the net Magnetic Field at a position 3m away from one end of the wire lying on the wire's axis is zero.
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