The core of a transformer is laminated because
The core of a transformer is laminated because Options (a) ratio of voltage in primary and secondary may be increased…
The core of a transformer is laminated because Options (a) ratio of voltage in primary and secondary may be increased…
The current through an inductor changes from 3 A to 2 A is 1 m/s. If induced e.m.f. in inductor…
Which of the following is the function of the step-up transformer? Options (a) Low voltage, high current to high voltage…
In an inductor when current changes from 2 A to 18 A in 0.05 sec, the e.m.f. induced is 20…
Energy in a current carrying coil is stored in the form of Options (a) electrical energy (b) magnetic field (c)…
In an LCR circuit, capacitance is changed from C to 2C. For the resonant frequency to remain unchanged, the inductance…
The material suitable for making electromagnets should have Options (a) High retentivity and high coercivity (b) Low retentivity and low…
Radiofrequency choke uses core of Options (a) Air (b) Iron (c) Air and iron (d) None of these Correct Answer:…
The magnetic flux linked with a circuit of resistance 100Ω increases from 10 to 60 Wb. The amount of induced…
The coefficient of mutual inductance of two coils is 6 mH. If the current flowing in one is 2A, the…