In this quiz, we will be focussing on current electricity which we use daily for charging up electrical devices and use in circuits for light. It is used for such simple purposes because it is easy to connect and disconnect energy-using devices, this is because it is easy to convert mechanical and solar energy into electrical energy. Physics quizzes like this one often have technical problems and taking this quiz will help you understand more about current electricity.
Consider a current carrying wire current I in the shape of a circle. Note that as the current progresses along the wire, the direction of j (current density) changes in an exact manner, while die current/remain unaffected. The agent that is essentially responsible for is
A resistance R is to be measured using a meter bridge. Student chooses the standard resistance S to be 100 Ω He finds the null point at l1 = 2.9cm. He is told to attempt to improve the accuracy. Which of the following is a useful way?
Two cells of emf’s approximately 5 V and 10 V are to be accurately compared using a potentiometer of length 400 cm.
Which of the following is wrong? Resistivity of a conductor is
For measurement of potential difference, a potentiometer is preferred over voltmeter because
A Daniel cell is balanced on 125 cm length of a potentiometer wire. Now the cell is short-circuited by a resistance 2 ohm and the balance is obtained at 100 cm. The internal resistance of the Daniel cell is
When there is an electric current through a conducting wire along its length, then an electric field must exist
A charge is moving across a junction, then
An electric heater is connected to the voltage supply. After few seconds, current gets its steady value then its initial current will be
In the series combination of two or more than two resistances
Combine three resistors 5 Q, 4.5 Q and 3 Q in such a way that the total resistance of this combination is maximum
In parallel combination of n cells, we obtain
In a Wheatstone bridge if the battery and galvanometer are interchanged then the deflection in galvanometer will
When a metal conductor connected to left gap of a meter bridge is heated, the balancing point
In a potentiometer of 10 wires, the balance point is obtained on the 7th wire. To shift the balance point to 9th wire, we should
The unit of emf is ___________.