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Solution


Q.

Match the following columns:                       [2006]

  Column I   Column II
(A) Dielectric ring uniformly charged (p) Constant electrostatic field out of system
(B) Dielectric ring uniformly charged rotating with angular velocity ω (q) Magnetic field strength
(C) Constant current in ring i (r) Electric field (induced)
(D) i=i0cosωt (s) Magnetic dipole moment

 
1 A – q, s; B – p; C – q, s; D – q, r, s  
2 A – q, s; B – q, r, s ; C – q, s; D – p  
3 A – p; B – q, s; C – q, s; D – q, r, s  
4 A – q, r, s; B – q, s; C – q, s; D – p  

Ans.

(3)

(1) Charge on dielectric ring will create an electrostatic field which is time independent.

(2) The rotating charge is like a current. This will create a magnetic field and a magnetic moment.

(3) Constant current in ring, so net charge is zero. Therefore, there will be no time-independent electric field. The current produces a magnetic field and a magnetic moment.

(4) i=i0cosωt. A changing magnetic field will be produced. This will create an induced electric field. Also, a changing magnetic moment will be produced.