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