PYQsNEET A long wire carrying a steady current is bent into a circular loop of one turn. The magnetic field at the centre of the loop is B. It is then bent into a circular coil of n turns. The magnetic field at the centre of this coil of n turns will be: 1. nB 2. n2B 3. 2nB 4. 2n2B Ruhul Amin Alig
PYQ Twenty seven drops of same size are charged at 220 V each. They combine to form a bigger drop. Calculate the potential of the bigger drop. 1. 1520 V 2. 1980 V 3. 660 V 4. 1320 V Ruhul Amin Alig
PMQ Two charged spherical conductors of radius R 1 and R 2 R1 and R2 are connected by a wire. Then the ratio of surface charge densities of the spheres ( σ 1 / σ 2 ) σ1/σ2 is: 1. √ ( R 1 R 2 ) R1R2 2. R 2 1 R 2 2 R12R22 3. R 1 R 2 R1R2 4. R 2 R 1 R2R1 Ruhul Amin Alig
PMQ The diode used in the circuit shown in the figure has a constant voltage drop of 0.5 V at all currents and a maximum power rating of 100 milliwatts.What should be the value of the resistor R, connected in series with the diode for obtaining maximum current? 1017973 A 1.5 Ω B 5 Ω C 6.67 Ω D 200 Ω Ruhul Amin Alig
