A very long conducting wire is bent in a semi- circular shape from A to B as shown in figure. The magnetic field at pointP for steady current configuration is given by:
Held on 30 Apr 2023 · Verified 9 Jul 2026.
4Rμ0i[1−π2] pointed into the page
4Rμ0i pointed into the page
4Rμ0i pointed away from the page
4Rμ0i[1−π2] pointed away from the page
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Two point charges +2μC and -2μC are placed 10 cm apart. The electric field at the midpoint is:
A constant voltage of 50 V is maintained between the points A and B of the circuit shown in the figure. The current through the branch CD of the circuit is :- 
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To an ac power supply of 220 V at 50 Hz , a resistor of $20 \Omega$, a capacitor of reactance $25 \Omega$ and an inductor of reactance $45 \Omega$ are connected is series. The corresponding current in the circuit and the phase angle between the current and the voltage is, respectively-
A wire of resistance R is cut into 8 equal pieces. From these pieces two equivalent resistances are made by adding four of these together in parallel. Then these two sets are added in series. The net effective resistance of the combination is :
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