6. Two resistanee and Raeive combined resistance 4.5 ohms when in series and 1 o

Question

6. Two resistanee and Raeive combined resistance 4.5 ohms when in series and 1 ohms when in parallel the resistances are lai 30 and Ri 6 (e) and (di 20 and 2.50 At shown in the diagram abar nagnet is pushed into solenoid, what is the direction of deneetion the gaivanometer needle when the bar magnetis passing the exact midpoint of the selenoid? (a) it moves to the left. (b) moves to the right (0 moves to the left and then the right (d) it has no deflection and hence points to the zero All of the following can induce an enfin a coll of wire ExECPT: (a) Moving a magnet through the coil. (b) Placing a stationary coil of wire in an increasing magnetic field. (c) Placing a stationary coil of wire in a stationary magnetic field. (d) Placing a stationary coil of wire in a decreasing magnetic field. (e) Moving both the coil of wire and a magnet away from each other at the same speed. 9. Adevice which converts electrical energy to the mechanical energy is called electric motor/ electric generator, 10. The power output of up transformer is greater than/less than/ the same as the input a set power of the transformer,

Explanation / Answer

6.

In series

R1+R2=4.5-------------1

In parallel

R1R2/R1+R2=1

R1R2=4.5

=>R2=4.5/R1

substituting in 1

R1+4.5/R1=4.5

R12-4.5R1+4.5=0

so

R1=1.5 ohms and R2=3 ohms

so answer is C

7)

It moves to the right

8)

Placing a stationary coil of wire in a stationary magnetic field

9)

Electric generator

10)

remains the same

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