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Jay Ghosh

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Jay Ghosh

Asked: December 12, 2024In: Class 12 Physics

When a lamp is connected to an alternating voltage supply, it lights with the same brightness as when connected to a 12 V d.c. battery. what is the peak value of alternating voltage source?

The peak voltage of alternating voltage source Vm = 12 × √2 , V = 17 V. Class 12 Physics Chapter 7 Alternating current Session 2024-2025.

Jay Ghosh

Asked: December 12, 2024In: Class 12 Physics

An a.c. I = Im sin wt produces certain heat H in a resistor R over a time T = 2π/w . write the value of d.c. that would produce the same heat in the same resistor in the same time.

Equivalent value of d.c. = I effective = Im/√2 . Class 12 Physics Chapter 7 Alternating current Session 2024-2025.

Jay Ghosh

Asked: December 12, 2024In: Class 12 Physics

The electric mains in the house are marked 220 V, 50Hz. Write down the equuation for instantaneous voltage.

Equation for instantaneous voltage is V = 220 × √2 sin 2π (50)t = 311 sin 314t. Class 12 Physics Chapter 7 Alternating current Session 2024-2025.

Jay Ghosh

Asked: December 12, 2024In: Class 12 Physics

Difine the term ‘mutual inductance’ between the two coils.

Mutual inductance of two neighbouring coils is numerically equal to the amount of magnetic flux linked with one coil when unit current flows through the other coil. Class 12 Physics Chapter 6 Electromagnetic Induction Session 2024-2025.

Jay Ghosh

Asked: December 11, 2024In: Class 12 Physics

A solenoid is connected to a battery so that a steady current flows through it. if an iron core is inserted into the solenoid, will the current increase or decrease?

The current flowing through solenoid coil decrease. As the iron core is inserted into the solenoid, the magnetic field and consequently the magneti flux increases. in accordance with Lenz;s law the induced current resists the increase in magnetic flux. Hence, ...

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