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A magnetic field of uniformly increasing magnitude is directed into the plane of the page as shown. A conducting loop of wire is on the plane of the page.

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Which is correct about the direction and magnitude of the induced current in the wire respectively? 

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Important Questions on Electromagnetic Induction (HL)

MEDIUM
Diploma
IMPORTANT

A loop of the wire contains two identical light bulbs, L1 and L2. The region in the loop contains a changing magnetic field whose direction is normal to the plane of the page. Both light bulbs are lit. A copper wire is placed across the loop as shown in the diagram.

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What will be the effect of this wire on the brightness of the light bulbs?

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Diploma
IMPORTANT

A conducting loop of wire is in a region of magnetic field directed into the plane of the page. The loop is rotated about axes I, II and III.

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In which case or cases will there be an induced current in the loop.

MEDIUM
Diploma
IMPORTANT

The graph shows the variation with the time of the power dissipated in a resistor of resistance 2.0 Ω  In an ac circuit.

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What is the rms value of the voltage across the resistor (in Ω) and the period of the current (in s)?

MEDIUM
Diploma
IMPORTANT
A parallel plate capacitor is connected to a battery of fixed emf. The energy stored in the capacitor is E and the charge on one of the plates is q . A dielectric is inserted between the plates. What will happen in the capacitance and charged stored respectively?
MEDIUM
Diploma
IMPORTANT
Capacitor X has a capacitance 200 pF and potential difference 100 V. Capacitor Y has capacitance 100 pF and potential difference 200 V. What is the energy and charge stored by capacitor respectively?
MEDIUM
Diploma
IMPORTANT

In the circuit shows a capacitor that is initially uncharged is being charged by a battery.

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Which of the following is a correct graph of the variation of the potential difference V across the plates with charge q on one of the capacitor plates?

MEDIUM
Diploma
IMPORTANT

What will the initial current be in the below the instant the switch is closed, and what will it be eventually a long time after the switch is closed? (answer in order)

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MEDIUM
Diploma
IMPORTANT

The graph shows the variation with time t of the current I for a discharging capacitor.

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What is the time constant of this system?(in sec)