Consider the following sources:1. A permanent magnet2. A charged disc rotating at uniform speed3. An accelerated charge4. An electric field which changes linearly with timeWhich of the above sources are the sources of steady magnetic field?

Consider the following sources:1. A permanent magnet2. A charged disc

1.	Consider the following sources:1. A permanent magnet2. A charged disc rotating at uniform speed3. An accelerated charge4. An electric field which changes linearly with timeWhich of the above sources are the sources of steady magnetic field?
A.	1, 2 and 3 only
B.	3 and 4 only
C.	1, 2 and 4 only
D.	1, 2, 3 and 4
Answer» D. 1, 2, 3 and 4

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Consider the following sources:1. A permanent magnet2. A charged disc rotating at uniform speed3. An accelerated charge4. An electric field which changes linearly with timeWhich of the above sources are the sources of steady magnetic field?

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