Physics 002 Midterm Study Example

The electric field lines of a positively charged particles are: 1) Radial and outwards 2) Radial and inwards 3) Circular and anticlockwise 4) Circular and clockwise

!) Radial and outwards

Two electric field lines due to a point charge. 1) Never intersect 2) May intersect near the charge 3) Always intersect 4) None of these

1) never intersect

How many resistances are used in a Wheatstone bridge? 1) 3 2) 4 3) 5 4) 6

3

An uncharged capacitor and a resistor are connected in series shown in the figure. The battery's emf is V=12V C=8μF, R=500kΩ. After the switch is closed, find the time constant of the RC circuit.

4 SECONDS

What is the resistance of a resistor if the current going through it is 2A and the voltage across it is 10V? 1) 5 ohm 2) 10 ohm 3) 25 ohm 4) 15 ohm

5 ohm

If each resistor has a value of 2ohm, how much current if flowing through the circuit? 1) 6A 2) 12A 3) 24A 4) 48A

6A

Two equipotential lines or two force lines from a given charge distribution always cross each other. 1) True 2) False

False

Which instrument is used as the null detector in the Wheatstone bridge? 1) Voltmeter 2) Ammeter 3) Galvanometer 4) Multimeter

Galvanometer

In the following RC circuit, the total resistance is 20kΩ, and the battery's emf is 12 V. Suppose the time constant of this RC circuit is 18μs. Find, the time it takes the voltage across the resistor to reach 9 V after closing the switch.

Not possible ?

If two-point charges, one is positive and other is negative are kept at a certain distance then the electric field lines will: 1) Start from negative charges and end at positive charges 2) Start from positive charges and end at negative charges 3) Start from both charges and end at infinity 4) Cannot say

Start from negative charges and end at positive charges

The magnetic field lines outside the bar magnet. 1) Start from south pole and end at north pole 2) Start from north pole and end at south pole 3) Start from both pole and end at infinity 4) None of these

Start from north pole and end at south pole

Which of the following is correct for electric field lines 1) The field lines are perpendicular to the surface of the charged body 2) More number of lines means more magnitude of electric field 3) The field lines never intersect each other 4) All of these

The field lines never intersect each other.

The equation of a balanced Wheatstone bridge is PR= QS 1) True 2) False

True

The external field about a magnet varies inversely with the square of the distance from the pole? 1) True 2) False

True