Q25. | When a paramagnetic substance is magnetized, there are small changes in dimensions. The phenomena is called |
Q26. | the phenomena of restriction occurs when ferromagnetic substance is magnetized resulting in |
Q27. | magnetostriction is a phenomenon of |
Q28. | core of an electromagnet should have |
Q29. | the electromagnet is made of |
Q30. | the magnetic field required to reduce the residual magnetization to zero is called |