A sensitive microphone cannot withstand currents greater than 0.05 A when connected across a thermocouple of emf 8.5 m V , the current in a very low resistance ammeter placed in series in the circuit reads 34 mA. What is the resistance of the microphone?

A resistance of 97 Omega is connected to a battery of emf 10 V . To measure the current passing in the circuit, an ammeter is inserted in series with the resistance. It is found that the ammeter reads 100 mA. What is the internal resistance of the battery if 2 Omega is the resistance of ammeter ?

A battery of e.m.f 10V and internal resistance 3Omega is connected to a resistor.If the current in the circuit is 0.5A,then the resistance of the resistor is

When a resistance of 2 Omega is connected across the terminals of a cell, the current is 0.5 A. When resistance is increased to 5 Omega , the current is 0.25 A. the emf of the cell is

An ammeter reads a current of 30A when it is connected across the terminals of a cell of emf 1.5V. Neglecting the meter resistance, find the amount of heat produced in the battery in 10seconds?

An ammeter reads a current of 30A when it is connected across the terminals of a cell of emf 1.5V. Neglecting the meter resistance, find the amount of heat produced in the battery in 10seconds?

An ammeter reads a current of 30 A when it is connected across the terminals of a cell of emf 2 V. Neglecting the meter resistance, find the amount of heat (in calories) in cell in 20 seconds.

When a resistance of 2 ohm is connected across terminals of a cell, the current is 0.5 A . When the resistance is increased to 5 ohm, the current is 0.25 A The e.m.f. of the cell is

When a 4V battery is connected across an unknown resistor there is a current of 100 mA in the circuit. The value of the resistance of the resistor is: