Question

12-16

an 3 of 8 12V in un The total equivalent resistance of the circuit shown above is (A) 05 (B) 92 (759 (D) 6 (E) 2 13. In the circuit shown above, what is the value of the potential difference between points X and Y if the wholery has no internal resistance? (A) IV (B)2V (C)3V (D) 4V (E) 6V A lamp, a voltmeter V, an ammeter A and a battery with zero internal resistance are connected as shown above. Connecting another lampin parallel with the first lampas shown by the dashed lines would (A) decrease the ammeter reading (B) increase the ammeter reading (C) increase the voltmeter reading D) decrease the voltmeter reading (E) produce no change in either meter reading Preten 15. A proton traveling with speed ventes a uniform clectric field of magnitude E, directed to the right and parallel to the plane of the page, as shown in the figure on the right. There is also a magnetic force on the proton that is in the direction opposite to that of the clectric force Which of the following is a possible direction for the magnetic field? (A) Bottom of page (B) Top of page to the left (D) (directed out of the page directed into the page 16. A wire in the plane of the page carries a current directed toward the bottom of the page as shown above. If the wire is in a uniform magnetic field B directed out of the page, the force on the wire resulting from the magnetic field is (A) directed into the page (B) directed out of the page directed to the right (D) directed to the left (E) directed out of the page

Answer 1

Question 12

Equivalent resistance of the circuit

R = 4 + [(3×6)/(3+6)] Ohm

= 6 Ohm

Question 13

Current in the circuit I = V/R

= 12/6 A

= 2 A

Potential drop across 4 Ohm resistance is V' = 2×4 Volt

= 8 Volt

Now potential difference between X and Y is

V_XY = 12 - 8 volt

= 4 Volt

Question 14

Since the Second bulb is connected in parallel, so there will be no change in current in the circuit, hence ammeter reading. Also voltage will also be the same, so voltmeter reading will not change.

# Last option is correct.