﻿ An emf E = 100 sin 314t volt is applied across a pure capacitor of 637 . Find the instantaneous current i. : Kaysons Education

# An emf E = 100 Sin 314t volt Is Applied Across A Pure Capacitor Of 637 . Find The Instantaneous Current i.

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## Question

### Solution

Correct option is

20 cos 314t

.

In a pure capacitor the current leads the voltage by 90o. Therefore, the instantaneous current is given by

.

Substituting this value of i0 in eq. (i), we get

.

#### SIMILAR QUESTIONS

Q1

In a dynamo, a coil of area 0.2 m2 and having 100 turns rotates in a magnetic field of 0.1 Wb m–2 with an angular velocity of 100 rad s–1. The output terminals are connected through a resistance of . Calculate the torque , as a function of time t, required to keep the coil rotating.

Q2

The electric main in a house is marked 220V-50Hz. Write down the equation for instantaneous voltage.

Q3

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Q8

An alternating voltage E = 200 sin 300t is applied across a series combination of  and L = 800 mH. Calculate the impedance of the circuit.

Q9

A coil of inductance 0.50 H and resistance  is connected to a 240 V-50 Hz a.c. supply. What are the maximum current in the coil and the time lag between voltage maximum and current maximum?

Q10

An a.c. voltage V = 200 sin 314t is applied across a series C-R circuit.Where . Find the capacitive reactance.