Why is the core of a transformer laminated?

Transformer core is laminated to reduce Eddy currents. Eddy currents are formed in loop. In a whole piece of iron, a big loop of Eddy current will form, which will have stronger effect. So, we laminated the core such that Eddy currents are formed in each lamina separately, of smaller size (due to increased path size of current and increased resistance). Thus energy less due to Eddy currents is reduced.

E M B I B E

Gamma Question Bank for Medical Physics>Chapter 22 - Alternating Current>Assignment Set-1>Q 31

MEDIUM

NEET

IMPORTANT

Earn 100

Draw graph to show the variation of inductive and capacitive reactance with the frequency of applied voltage.

Important Questions on Alternating Current

EASY

NEET

IMPORTANT

Gamma Question Bank for Medical Physics>Chapter 22 - Alternating Current>Assignment Set-1>Q 32

A bulb and a capacitor are connected in series to a source of alternating current. What will happen on increasing the frequency of the current?

MEDIUM

NEET

IMPORTANT

Gamma Question Bank for Medical Physics>Chapter 22 - Alternating Current>Assignment Set-1>Q 33

The ac voltage is applied in circuits (a) (b) (c). If the frequency of emf is increased, what will be the effect upon current in these circuits?

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MEDIUM

NEET

IMPORTANT

Gamma Question Bank for Medical Physics>Chapter 22 - Alternating Current>Assignment Set-1>Q 34

A bulb is connected in series with a variable capacitor. Will the bulb glow when this combination is connected to a DC supply/an AC supply? What would happen in each case, if the capacitance is reduced?

EASY

NEET

IMPORTANT

Gamma Question Bank for Medical Physics>Chapter 22 - Alternating Current>Assignment Set-1>Q 35

When a capacitor is connected in series with a series

L - R

circuit, the

AC

flowing in the circuit increases. Explain.

EASY

NEET

IMPORTANT

Gamma Question Bank for Medical Physics>Chapter 22 - Alternating Current>Assignment Set-1>Q 36

An

AC

circuit has a power factor of

0.5

. What will be the phase difference between voltage and current in this circuit? Can you also tell whether the current leads the voltage or the voltage leads the current?

EASY

NEET

IMPORTANT

Gamma Question Bank for Medical Physics>Chapter 22 - Alternating Current>Assignment Set-1>Q 37

In the adjoining $AC$ circuit, $R$ is a pure resistance and $X$ is an unknown circuit element. Using only an $AC$ voltmeter how will you detect whether $X$ is (i) pure inductance ?

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