Two resistance Ri and Ra give combined resistance 4,5 ohms when inseries and 10m

Question

Two resistance Ri and Ra give combined resistance 4,5 ohms when inseries and 10mms when parallel. The resistances are: (a) Ris 30 and Ra 6 (b) R133 n and R249 n (c) R131.5 n and R 30 (d) Ria 2 n and R2 2.50 As shown in the diagram, a bar magnet is pushed into solenoid, what is the direction of deflection of the galvanometer needle when the bar magnet is passing the exact midpoint ofse solenoid? (a) It moves to the left. (b) It moves to the right. (c) It moves to the left and then the right. (d) It has no deflection and hence points to the zero 8- All of the following can induce an emfin a coil of wire ExECPT: (a) Moving a magnet through the col (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- A device which converts electrical energy to the mechanical energy is called electric motor/ electric generator. 10. The of set up transformer is greater than/less than the same as the input power output a power of the transformer.

Explanation / Answer

Answers

6)   (c) R1 = 1.5 ohm & R2 = 3 ohm

7) (a) It moves to the left.

8) (e) Moving both the coil of a wire and a magnet away from each at same speed .

9) A device which converts electrical energy to the mechanical energy is called is called electric motor .

10) The power output of a set up transformer is greater than the input power of the transformer .

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